Screening for Anemia and Iron Deficiency in the Adult Portuguese Population
Table 3
Prevalence and prevalence ratio of iron deficiency in nonpregnant and pregnant women stratified by age group and pregnancy trimester.
Group
ID
N
n
Prevalence, % (95% CI)
PR (95% CI)
Total
NPW in fertile agea
3500
2553
72.9 (71.4–74.4)
1 (reference)
Pregnant women
1125
1066
94.8 (93.3–96.0)
1.30 (1.27–1.33)
1st trimester
41
36
87.8 (73.8–95.9)
1.20 (1.07–1.35)
2nd trimester
633
588
92.9 (90.6–94.8)
1.27 (1.24–1.31)
3rd trimester
451
442
98.0 (96.2–99.1)
1.34 (1.31–1.38)
18–26 years
3
NPW in fertile agea
870
679
78.0 (75.1–80.8)
1 (reference)
Pregnant women
203
195
96.1 (92.4–98.3)
1.23 (1.18–1.29)
1st trimester
10
10
100 (69.2–100)
1.28 (1.24–1.33)
2nd trimester
117
110
94.0 (88.1–97.6)
1.21(1.14–1.28)
3rd trimester
76
75
98.7 (92.9–100)
1.26 (1.21–1.32)
27–35 years
NPW in fertile agea
1285
932
72.5 (70.0–75.0)
1 (reference)
Pregnant women
723
682
94.3 (92.4–95.9)
1.30 (1.25–1.35)
1st trimester
23
19
82.6 (61.2–95.0)
1.14 (0.94–1.38)
2nd trimester
414
383
92.5 (89.5–94.9)
1.28 (1.22–1.33)
3rd trimester
286
280
97.9 (95.5–99.2)
1.35 (1.30–1.40)
36–44 years
NPW in fertile agea
1345
942
70.0 (67.5–72.5)
1 (reference)
Pregnant women
199
189
95.0 (91.0–97.6)
1.36 (1.30–1.42)
1st trimester
8
7
87.5 (47.3–99.7)
1.25 (0.96–1.63)
2nd trimester
102
95
93.1 (86.4–97.2)
1.33 (1.25–1.42)
3rd trimester
89
87
97.8 (92.1–99.7)
1.40 (1.33–1.46)
CI; confidence interval; ID, iron deficiency; N, total number of participants; n, number of participants with iron deficiency; NPW, nonpregnant women; PR, prevalence ratio. aSubgroups of nonpregnant women matched to the same age groups of the pregnant women. value <0.01, value <0.001; Wald chi-square test. Nonpregnant women ≤51 years versus >51 years.
