Table 2.

Social background of responders

Characteristics relating to social background	Preterm/LBW delivery (n = 31)	Term AFD delivery (n = 287)	p value	Term AFD delivery		p value
				Primipara (n = 141)	Multipara (n = 146)
Unwanted pregnancy
Yes	1 (3.2 %)	8 (2.8 %)	0.023	3 (2.1 %)	5 (3.4 %)	0.525
Not sure	10 (32.3 %)	39 (13.6 %)		22 (15.6 %)	17 (11.7 %)
No	20 (64.5 %)	239 (83.6 %)		116 (82.3 %)	123 (84.9 %)
Support from husband during pregnancy
Yes	25 (80.6 %)	246 (85.7 %)	0.654	116 (82.2 %)	130 (89.8 %)	0.210
Not sure	4 (12.9 %)	31 (10.8 %)		18 (12.8 %)	18 (12.4 %)
No	2 (6.5 %)	10 (3.5 %)		7 (5.0 %)	7 (4.8 %)
Family composition
Nuclear family	23 (74.2 %)	247 (86.7 %)	0.102	119 (84.4 %)	128 (88.9 %)	0.298
Extended family	8 (25.8 %)	38 (13.3 %)		22 (15.6 %)	16 (11.1 %)
Number of children	1.6 ± 0.7 2.0 [1–4]	1.6 ± 0.7 2.0 [1–4]	0.881	1.0 ± 1.9 1.0 [1–3]	2.2 ± 0.5 2.0 [1–4]	<0.001
Siblings
Yes	16 (51.6 %)	145 (50.7 %)	1.000	2 (1.4 %)	143 (98.6 %)	<0.001
No	15 (48.4 %)	141 (49.3 %)		139 (98.6 %)	2 (1.4 %)
Employment status
Homemaker	20 (64.5 %)	167 (58.6 %)	0.654	83 (58.9 %)	84 (58.3 %)	0.934
On maternity leave	9 (29.0 %)	105 (36.8 %)		51 (36.1 %)	54 (37.5 %)
Working	2 (6.5 %)	13 (4.6 %)		7 (5.0 %)	6 (4.2 %)
Annual income (in million yen)
<2	1 (3.8 %)	12 (4.3 %)	0.932	12 (8.6 %)	0 (0.0 %)	0.007
2 to ≤4	14 (53.9 %)	123 (44.7 %)		63 (45.0 %)	60 (44.2 %)
4 to ≤6	9 (34.7 %)	97 (35.2 %)		44 (31.4 %)	53 (39.0 %)
6 to ≤8	1 (3.8 %)	26 (9.4 %)		15 (10.7 %)	11 (8.1 %)
8 to ≤10	1 (3.8 %)	12 (4.3 %)		5 (3.6 %)	7 (5.1 %)
10 to ≤12	0 (0.0 %)	4 (1.4 %)		0 (0.0 %)	4 (2.9 %)
12 to ≤14	0 (0.0 %)	2 (0.7 %)		1 (0.7 %)	1 (0.7 %)

Data are presented as the mean ± SD; for “Number of children, the median plus the range in square parenthesis are also given