Caesarean section by maternal age group among singleton deliveries and primiparous Japanese women: a secondary analysis of the WHO Global Survey on Maternal and Perinatal Health

Table 1 Characteristics of nulliparous women with singleton birth N = 1747

Characteristics	Maternal age group, years						Adjusted x ², P
	≤29		30–34		≥35
	(n = 702)		(n = 677)		(n = 368)
	n	%	n	%	n	%
Marital status
Maried/cohabited	661	94.4	665	98.5	358	97.3	<0.001
Single	39	5.6	10	1.5	10	2.7
Number of antenatal care visits
< =12	440	63.7	361	54.6	186	52.3	<0.05
> 12	251	36.3	300	45.4	170	47.7
BMI (kg/m²)
18.5 to 25.0	446	63.5	429	63.4	213	57.9	0.19
> 25	256	36.5	248	36.6	155	44.1
Height
< 1.5 m	30	4.3	23	3.4	13	3.5	0.44
> 1.5 m	672	95.7	654	96.6	355	96.5
Pre-exiting medical conditions^a	98	14.0	102	15.1	94	26.5	<0.001
Health institutional type
Public	312	44.4	239	35.3	130	35.3	0.23
Private	390	55.6	438	64.7	238	64.7

^aPre-exiting medical conditions was defined as presence of any of followings: chronic hypertension, cardiac/renal diseases, chronic respiratory conditions, diabetes mellitus, sickle cell anaemia, severe anaemia and pyelonephritis or urinary infection
Study-design based Pearson’s chi-2 test was calculated

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