Table 1.

Demographic factors in 1994–1996 and 2003–2004, Shihezi, Xinjiang, PR China

		1994–1996		2003–2004
Characteristic	Values	n	%	n	%
Ethnicity	Han Chinese	797	97	490	89.9
	Minorities	25	3	55	10.1
Maternal work	Farmer	138	16.8	60	10.9
	Housewife	68	8.3	174	32.0
	Worker	442	53.8	82	15.1
	Office Worker	118	14.3	82	15.1
	Others	56	6.8	142	26.8
Gestation	<37 Weeks	33	4	7	1.7
	37–41 Weeks	720	87.6	397	96.1
	42+ Weeks	69	8.4	9	2.2
	Missing			132
Birth Order	1	737	89.7	483	88.8
	2+	85	10.3	61	11.2
Baby's Gender	Male	444	54	280	51.4
	Female	378	46	265	48.6
Birth Weight	<2500 g	36	4.4	11	2.1
	2500–2999 g	132	16.1	60	11.5
	3000–3499 g	358	43.5	191	36.5
	3500–3999 g	232	28.2	214	40.8
	4000 g+	64	7.8	48	9.2
	Missing			21
Total		822		545