Table 3.

Pearson's X ² analyses of the marital status, ethnic group and infants' gender performed for each reference sample (before giving birth: T1 = 12–14, T2 = 20–24, and T3 = 30–34 weeks of gestational age; after giving birth: T4 = day 4th and T5 = 6 months).

Sample	Statistic	Ethnic group	Marital status	Parity	Sex
T1/T2	N	33	33	33	32
	X	0.69	0.896	1.517	1.26
	df	2	2	1	1
	p	0.71	0.64	0.22	0.72
	Φ	0.14	0.164	0.21	0.198
T3/T4	N	25	25	25	25
	X	0.663	0.59	2.71	0.65
	df	2	2	1	1
	p	0.72	0.75	0.10	0.42
	Φ	0.16	0.15	0.33	0.161
T5	N	25	25	25	25
	X	0.11	1.5	1.72	0.2
	df	2	2	1	1
	p	0.95	0.47	0.19	0.65
	Φ	0.07	0.25	0.26	0.09