Journal of Obesity

Journal of Obesity / 2016 / Article
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The Effect of Early Life Factors and Early Interventions on Childhood Overweight and Obesity 2016

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Review Article | Open Access

Volume 2016 |Article ID 2489021 | https://doi.org/10.1155/2016/2489021

Ingrid K. Richards Adams, Chizimuzo T. C. Okoli, Akilah Dulin Keita, Ana Maria Linares, Keiko Tanaka, Joshua R. Polanin, Annie Koempel, "Breastfeeding Practices among Native Hawaiians and Pacific Islanders", Journal of Obesity, vol. 2016, Article ID 2489021, 9 pages, 2016. https://doi.org/10.1155/2016/2489021

Breastfeeding Practices among Native Hawaiians and Pacific Islanders

Academic Editor: Li Ming Wen
Received04 Apr 2016
Accepted25 Aug 2016
Published28 Sep 2016

Abstract

Background. Breastfeeding is associated with a decreased risk of obesity in the early and adult years. Native Hawaiians and Pacific Islanders (NHPI) experience high rates of obesity which is often obfuscated with aggregated data. Using disaggregated data, we examined breastfeeding practices among NHPI. Methods. Seven databases and reference lists were searched. Two independent researchers extracted relevant studies based on predetermined criteria. Nine studies met our inclusion criteria and a meta-analysis was conducted using random-effects, inverse-various weighted models. Results. Few studies disaggregated NHPI populations when examining breastfeeding practices. Most studies were cross-sectional and our search yielded no randomized or quasirandomized control trials. The results of the meta-analysis indicated that 46.5% NHPI women initiated breastfeeding with 40.8% breastfeeding exclusively. These pooled analyses show that NHPI breastfeeding practices are below the recommended national and international goals and guidelines. Conclusion. Breastfeeding practices among NHPI are heterogeneous and critical disparities exist among certain NHPI subgroups and additional research needs to be conducted to determine the reasons for the disparity. Future studies should work to disaggregate data for NHPI and the various subpopulations. Multicomponent, multilevel strategies are needed to support breastfeeding practices among NHPI.

1. Introduction

Obesity prevention begins with breastfeeding [1] and infancy (0 to 3 years) is a critical period in obesity development [2]. Recent research suggests a 15% to 30% reduction in adolescent and adult obesity rates with breastfeeding during infancy compared with none [1, 37]. Breastfeeding’s effects are dose dependent, with exclusive breastfeeding (EBF) and breastfeeding for long durations offering increased benefits [4, 813], including several short- and long-term medical, neurodevelopmental, and immunological cognitive advantages [1419]. Due to these benefits, EBF is recommended for a minimum of six months after birth, followed by continued breastfeeding for a minimum of one year [1, 2023].

Native Hawaiian and Pacific Islanders (NHPI) are a rapidly growing population and constitute approximately 1.2 million of the Asian American population either alone (44%) or in combination with other races (56%) [24]. Because NHPI are often conflated with Asian Americans and other Pacific Islanders in national and state-level data, disparities among them are often unnoticed. For example, when breastfeeding data are disaggregated by race and ethnicity, studies show that NHPI have lower breastfeeding initiation and EBF rates and have shorter breastfeeding duration than other populations [2527]. This is concerning because NHPI populations experience higher rates of obesity and obesity-related comorbidities and mortality than other populations, but improving breastfeeding practices can ameliorate obesity-related issues [2834]. Although steps have been taken to separate Asian and NHPI in census data, the problem of aggregating these groups is still prevalent [35].

Currently, there are no systematic reviews on breastfeeding practices that disaggregate data on NHPI. The information from such a systematic review can provide policy makers, researchers, and public health workers a means to support and enhance breastfeeding practices among NHPI while addressing the problem of high obesity. Therefore, the objectives of this study are to provide a systematic review and meta-analysis of breastfeeding practices used by NHPI in terms of initiation, EBF, and duration.

2. Methods

Searches were conducted in July 2013, October 2014, and updated in January 2016 in the online bibliographic databases PubMed, AGRICOLA, CENTRAL, CINAHL, PsychInfo, Sociological Abstracts, and Web of Knowledge for studies examining breastfeeding practices among NHPI. We used Medical Subject Heading (MeSH) terms in PubMed and other indexing terms for the respective databases, as well as text wording. Our initial searches combined the following terms: breast feeding, breast-feeding, breastfeeding, breastfed, breast fed, breast-fed, child, preschool, infant, Pacific Island, Oceanic ancestry group, Hawaii, breastfeed, bottle feeding, formula fed, formula milk, human milk, infant feeding, weaning, child preschool, infant, and pregnancy. We did not include language or date restrictions in our searches. Two researchers (IA and AK) independently scanned the reference lists of all relevant papers retrieved and extracted relevant studies using predetermined inclusion and exclusion criteria. Discrepancies were resolved through discussion so that consensus could be attained.

2.1. Inclusion

Studies were included if data were disaggregated for NHPI populations and if they were directly related to breastfeeding practices. Excluded articles were those that were conducted outside of the United States or the Pacific Islands (Micronesia, Melanesia, and Polynesia) or qualitative in nature.

2.2. Coding

Two researchers independently coded studies for type, sample size, outcome measures, and effect size. The effect size of interest was the proportion of mothers who adopted certain breastfeeding practices (initiation, exclusive breastfeeding, and duration) or children on whom these practices were used.

2.3. Synthesis

We performed two synthesis techniques: (1) a narrative report of breastfeeding practices among NHPI samples in all studies and (2) a meta-analysis of various breastfeeding practice measures using a random-effects, inverse-various weighted model, with effect sizes grouped according to similar measurement constructs. For example, we synthesized measures of breastfeeding initiation separately from breastfeeding duration and exclusivity. Heterogeneity among the effect sizes was calculated using index [43]. All analyses were conducted using R package metafor [44].

3. Systematic Review

We identified 718 articles from which we removed 336 duplicates; and, of 382 articles screened for potential relevance, 348 were excluded. Thirty-four articles were assessed for eligibility. Further studies were excluded because they (1) were outside of the United States or Pacific Islands (), (2) addressed complementary feeding or did not disaggregate NHPI from other ethnic groups (), (3) described interventions (without reporting effects) (), and were secondary data from other included studies. Hence, nine studies were included in our final results. See Figure 1.

4. Main Findings of the Selected Studies

Study dates ranged from 1969 to 2013. Six studies were conducted before the year 2000. Studies were cross-sectional [26, 27, 36, 37, 39, 41] and each one was cohort [38], panel [40], and univariate descriptive [42]. Furthermore, just over half of the studies were conducted in Hawaii or used Hawaiian datasets [26, 27, 36, 39, 41], and six focused on ethnically diverse populations [26, 27, 36, 3941], four only on populations in the Pacific Islands [37, 38, 40, 42], and one solely on Native Hawaiians [27]. See Table 1.


Authors, yearType of studySample by location/region and demographics Measures (breastfeeding initiation, duration, and exclusive)Results (main outcomes and/or effect sizes)

Brown and Adelson, 1969 [36]Cross-sectional studyHonolulu, Hawaii (mothers and children)
Ethnically and socioeconomically diverse Caucasian, Hawaiian, Japanese, and other populations;
Low and middle income;
Age (mean): children = 2-3 years; Low income mothers = 28.4 years; Middle income mothers = 29 years;
children = 281
mothers = 249
Indicators: initiation and duration
Initiation: ever breastfed
Duration: breast fed for at least 6 months
Approximately one-quarter of the women breastfed their infant. More middle than low income mothers breastfed
Ever breastfed: 25.0% of all infants (26.0% Caucasians; 50.0% Japanese; 29.0% Hawaiian; 32.0% other populations)
Breastfed at 6 months: 80.0% all infants

Jansen, 1979 [37]Cross-sectional studyHoniara and Nggela-Sandfly, Solomon Islands, Pacific Islands (mothers)
Ethnicity: Pacific Islanders
Age (mean): Honiara = 28.3 years; Ngella-Sandfly = 30.7 years 
(Honiara = 100, Ngella-Sandfly = 89)
Indicators: initiation and duration
Initiation: ever breastfed
Duration: breastfed for at least 6 months; breastfed for at least 12 months
All mothers from Honiara and Nggela-Sandfly breastfed their infant on the first day after delivery. Early weaning before 6 months was uncommon
Ever breastfed: 99.5%
Breastfed for at least 6 months: Honiara = 85.7%; Nggela-Sandfly = 93.3%
Breastfed for at least 12 months: Honiara = 78.6%; Nggela-Sandfly = 92.3%

Franks and Jurgensen, 1985 [38]Cohort studyKiribati, Abemama Atoll Village Clinic (children)
Ethnicity: Pacific Islanders 
Indicators: exclusive breastfeeding and duration
Exclusive breastfeeding: exclusive breastfeeding for 4 months
Duration: breastfed for 12 months
Most children were breastfed for the whole of their first 4 months of life. Just under half were still being breastfed at 12 months
Exclusive breastfeeding for 4 months = 92.0%
Breastfed for 12 months = 45.7%

Suganuma et al., 1988 [39]Cross-sectional studyOahu, Hawaii (mothers)
Ethnically diverse: Caucasian = 37.9%; Hawaiian = 20.3%; Filipino = 10.1%; Japanese = 13.2%; other populations = 18.3%
Age = not reported
Indicator: exclusive breastfeeding
Breastfed only at hospital discharge
Over half of the total sample reported exclusively breastfeeding their infant at hospital discharge. Infant feeding pattern varied considerably by ethnic group. The incidence of exclusive breastfeeding at hospital discharge was the highest among Caucasians and lowest among Filipinos. Just over half of Hawaiians breastfed
Breastfed only at hospital discharge: total = 57.5%; Caucasian = 70.4%; Hawaiian = 52.6%; Filipino = 33.3%; Japanese = 55.4%; other populations = 51.5%

Lambert and Yee, 1981 [40]Panel studySuva, Fiji (infants)
Ethnically diverse: Fijian, Indian, and other populations 
Age = 0–18 months
= varied depending on year of study
Indicator: exclusive breastfeeding
Breastfed only for at least 0–3 months; breastfed only for at least 4–6 months
The extent of breastfeeding declined over the period 1977–1980 among Fijians as well as other ethnic groups
Breastfed only for at least 0–3 months: Fijian 68.5%; Indian 33.8%; other populations 43.7%
Breastfed only for at 4–6 months: Fijian 48.4%; Indian 26.2%; other populations 19.3%

Kieffer et al., 1997 [41]Cross-sectional study (utilizing The Nutrition Survey)Hawaii (mothers)
Ethnically diverse: Filipinos US born (2.8%); Filipinos Philippines born (3.8%); Hawaiian (18.4%); Japanese (14.4%); Other/mixed populations (19.2%); White (41.3%).
Age = 27–30 years 
Indicator: exclusive breastfeeding
Breastfeeding only at hospital discharge
Mothers who breastfed were more likely to be white, older, married, and educated, have chosen their feeding method prior to pregnancy, and were primarily concerned with the health of their infant as a reason to breastfeed
Exclusive breastfeeding among Hawaiians = 18.4%
Data not disaggregated by ethnicity

Dodgson et al., 2007 [27]Cross-sectional study utilizing WIC dataOahu, Hawaii
Ethnicity: Native Hawaiians
Age (mean) = 26.71 years
Indicator: exclusive breastfeeding and duration
Exclusive breastfeeding: any breastfeeding at 1 month; any breastfeeding at 6 months
Duration: exclusively breastfed for at least 3 months; exclusive breastfeeding for at least 6 months
A small amount of women breastfed their infant exclusively for 6 months. Mothers who breastfed exclusively at initiation were significantly more likely to breastfeed for 6 months than women who partially breastfed at initiation. Most Native Hawaiian women combined exclusive breastfeeding and partial breastfeeding. More multiparous than primiparous women exclusively breastfed at initiation
Any breastfeeding at 1 month = 91.0%;
any breastfeeding at 6 months = 52.0%;
exclusively breastfed at least 3 months = 29.0%;
exclusive breastfeeding at least 6 months = 18.0%

Novotny et al., 2007 [42]Univariate descriptive studyCommonwealth of the Northern Mariana Islands (children)
Ethnicity: Pacific Islanders
Age = 6 months to 10 years
Indicators: exclusive breastfeeding and duration
Exclusive breastfeeding: Exclusive breastfeeding for 0–2; 2–4; 4–6; and 6 or more months
Duration of breastfeeding: breastfed for 9 to 12 months; received breastmilk for 12 or more months
Over three-quarters of the children were breastfed, while just over half were breastfed at 6 months. A smaller percentage was still being breastfed at one year
Exclusively breastfed: 46.0% were exclusively breastfed for 0–2 months; 23.0% were exclusively breastfed for 2–4 months; 21.0% were exclusively breastfed for 4–6 months; 9.0% were exclusively breastfed for 6 or more months; 15.0% were breastfed for 9–12 months; 22.0% received breastmilk for 12 or more months

Hayes et al., 2014 [26]Cross-sectional study by PRAMS dataHawaii (mothers)
Ethnically diverse: Caucasian = 21.3%; Native Hawaiian = 27.6%; Samoan = 2.9%; Filipino = 18.3%; Japanese = 12.2%; Chinese = 3.6%; Korean = 1.6%; Black = 2.4%; other populations = 10.2%
Age = 20–35 years
Indicator: exclusive breastfeeding
Exclusive breastfeeding at 8 weeks
There was a difference in the rates of exclusive breastfeeding by ethnic group. White mothers had the highest estimate followed by Korean and Black mothers. Disparity in exclusive breastfeeding rates was observed among NHPI subgroups
36.3% of all mothers exclusively breastfed for at least 8 weeks (Caucasian = 51.9%; Native Hawaiian = 31.8%; Samoan = 24.2%; Filipino = 28.9%; Japanese = 29.4%; Chinese = 33.8%; Korean = 38.0%; Black = 37.0%; Other = 41.7%)

5. Breastfeeding Initiation

Four studies examined breastfeeding initiation, three among Hawaiians and one in the Pacific Islands. In the first study, an initiation rate of 29.0% for Hawaiian mothers was observed as compared to 26.0% Caucasians and 50.0% Japanese [36]. In the second study, a 52.6% breastfeeding rate at hospital discharge was observed for Native Hawaiian women as compared to 70.4% Caucasian, 55.4% Japanese, and 33.3% Filipino [39]. In the third study, a 1-month initiation rate of 91.0% was observed for Native Hawaiian mothers attending WIC clinics [27]. Finally, among Pacific Islanders, all mothers on Honiara and Nggela-Sandfly breastfed their children [37]. The results of the meta-analysis indicated that less than half of mothers initiated breastfeeding %, 95% CI (26.9–66.1), .

6. Exclusive Breastfeeding

Six studies reported on EBF [26, 27, 38, 4042] with three in Hawaii and three in the Pacific Islands. The first study among only Native Hawaiians, reported 3- and 6-month EBF rates of 29.0% and 18.0%, respectively [27]. The second study showed a 31.8% EBF rate among Hawaiian mothers as compared to 51.9% White, 38.0% Korean, 37.0% Black, 33.8% Chinese, 29.4% Japanese, 28.9.4% Filipino, and 24.2% Samoan [26]. The third study found an 18.4% EBF rate among Hawaiians but did not disaggregate the data by ethnicity [41]. The fourth study in Fiji reported EBF rates of 68.5% at 3 months [40]. However, a decline was shown from 60.2% in 1977 to 45.6% in 1980. The fifth study in Kiribati reported EBF rates of 92.0% at 4 months [38]. The final study in the Commonwealth of the Northern Mariana Islands also found a decline in EBF rates with 46.0%, 23.0%, 26.0%, and 9.0% of children exclusively breastfed for 0–2 months, 2–4 months, 4–6 months, and 9 or more months, respectively [42]. Meta-analysis results showed that less than half of mothers reported EBF practices (%, 95% CI (17.8–63.7), ).

7. Breastfeeding Duration

Four studies in our review measured breastfeeding duration, three among Pacific Islanders and one among Native Hawaiians. The first study observed that 45.7% of all infants in Kiribati were breastfed at 12 months [38]. The second study among mothers in the Commonwealth of the Northern Marianas Island reported that 22.0% received breastmilk for 12 or more months [42]. The third study [37] mentioned that most mothers in both Honiara and Nggela-Sandfly were breastfeeding at 6 and 12 months. The fourth study in Oahu [27] reported a 6-month breastfeeding duration rate of 52.0% for all mothers. Due to the variability in measures of breastfeeding duration a meta-analysis could not be appropriately performed.

8. Discussion

The high incidence of obesity, low breastfeeding rates, and other chronic diseases among NHPI makes it imperative to study differences in breastfeeding practices in these populations. Our review found that breastfeeding practices among NHPI are heterogeneous, highlighting disparities in breastfeeding practices among certain NHPI subgroups [26]. Examining breastfeeding practices among NHPI can expose hidden health issues and trends, making it possible to unearth disparity [45].

Our systematic review yielded only nine studies spanning a 44-year period. Moreover, we found limited disaggregated data in national surveys and surveillance systems for these groups. We found no studies examining breastfeeding patterns and disaggregating data for NHPI in the US where approximately two-thirds of NHPI reside [34]. The NHPI population is a young population that is expected to increase exponentially by the year 2060 [46, 47], and it is also critical that mandates related to disaggregating NHPI data by distinct ethnic and racial groups separate from Asian Americans are implemented [34, 46]. There is a need to enhance the monitoring of breastfeeding practices in all US NHPI states, territories, and commonwealths to better identify risk factors for poor breastfeeding outcomes.

In addition, we found that varying terms and time periods were used for breastfeeding initiation, exclusivity, and duration among studies in our review. Such variations have also been observed among federally funded datasets, indicating a need for standardization of breastfeeding outcomes [45]. Future studies should implement consistent terminology for the purpose of comparing effects and replicating studies. In addition, it is important that studies use time frames (breastfeeding at 6 and 12 months and exclusive breastfeeding at 3 and 6 months) that are aligned with national objectives and national data collection and monitoring systems.

The result of our meta-analysis indicated that less than half of NHPI women initiated breastfeeding or breastfed exclusively. These pooled analyses show that NHPI breastfeeding practices are below the Healthy People 2020 goals. Qualitative studies have highlighted several factors that may affect breastfeeding practices among NHPI, namely, lack of knowledge, lactation problems, poor family and social support, social norms, embarrassment related to breastfeeding in public, employment and child care issues, and the education of health care providers, so that they can fully support the breastfeeding efforts of NHPI mothers [35, 48, 49]. Further research needs to be conducted to determine the reasons for the disparity in breastfeeding practices. We suggest, at a minimum, disaggregating survey data by the race/ethnicity in order that future analyst can use such data. Our search produced neither randomized nor quasirandomized controlled trials related to breastfeeding among NHPI. Studies are also needed to systematically explore the types of interventions that can enhance exclusive breastfeeding rates and duration among NHPI.

There are few important considerations that need to be noted in interpreting the findings of this review. The unclear definitions of breastfeeding terms, variability in the measurement periods, and the small number of studies are limitations. However, despite these concerns, the need for this study cannot be overemphasized as it illuminates disparities within the NHPI populations and brings to light the needs of a group that could potentially remain on the outskirts of policy decisions and focus.

9. Conclusion

Future studies should work to disaggregate NHPI data and identify barriers to breastfeeding among NHPI. Moreover, multicomponent, multilevel strategies directed toward NHPI communities are needed to support breastfeeding practices. Such studies can support existing culturally appropriate practices, advance health promotion activities, and provide directions for policies to minimize health-related morbidity, mortality, and disparities among the NHPI population.

Competing Interests

No competing financial interests exist.

Acknowledgments

This study was supported by the Robert Wood Johnson Foundation: New Connections Grant no. 19652. The authors would like to thank Dr. Rachel Novotny for her advice and suggestions during the preparation of the manuscript.

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Copyright © 2016 Ingrid K. Richards Adams et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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