Use of Herbal Dietary Supplement Si-Wu-Tang and Health-Related Quality of Life in Postpartum Women: A Population-Based Correlational Study

Table 1

Characteristics of study subjects according to the frequency of Si-Wu-Tang use during the 6-month postpartum period.

Characteristics	Frequency of Si-Wu-Tang use during
	the 6-month postpartum period			𝜒^2	𝑃
	0	1–10	>10
Total	10184	5806	2499
Previous Sheng-Hua-Tang use (%)^a
Yes	78.2	88.7	88.2	343.35	<0.001
No	21.8	11.3	11.8
Mothers' characteristics
Age (%)^a
<25 years	18.9	20.3	19.8	44.87	<0.001
25–29 years	35.7	37.0	40.0
30–34 years	32.1	31.6	29.8
≥35 years	13.3	11.1	10.4
Educational level (%)^a
Junior high school or below	15.1	13.3	13.3	43.44	<0.001
Senior high school	37.4	41.5	42.9
University or above	47.5	45.2	43.8
Employment status (%)^a
Yes	57.6	59.1	58.2	3.51	0.17
No	42.4	40.9	41.8
Family income per month (%)^a
<50,000 NT$	40.8	42.2	40.7	19.94	0.003
50,000–69,999 NT$	25.5	27.1	26.9
70,000–99,999 NT$	21.9	20.6	20.5
≥100,000 NT$	11.8	10.1	11.9
Parity (%)^a
1	51.7	48.4	48.6	28.46	<0.001
2	38.4	40.0	39.1
≥3	9.9	11.6	12.3
Method of delivery (%)^a
Normal spontaneous delivery	66.3	66.4	68.4	1.10	0.58
Caesarean section	33.7	33.6	32.6
Breastfeeding (%)^a
Ever	82.6	82.7	83.7	1.70	0.43
Never	17.4	17.3	16.3
Postpartum nursing centre (%)^a
Yes	6.9	7.5	8.5	8.44	0.02
No	93.1	92.5	91.5
Out-patient clinic visits during the past 4 weeks (%)^a
Yes	31.1	33.2	31.9	7.47	0.02
No	68.9	66.8	68.1
Infants' characteristics
Sex (%)^a
Male	52.3	51.5	52.2	0.95	0.62
Female	47.7	48.5	47.8
Low birth weight or preterm (%)^a
Yes	10.6	9.9	10.4	1.71	0.43
No	89.4	90.1	89.6
Primary nursery by mother (%)^a
No	14.2	13.8	14.3	7.56	0.27
Daytime	2.1	2.1	2.8
Evening or night	8.3	8.0	7.7
Whole day	75.4	76.1	75.2

aCalculated by column totals.