Table 2.

Newborn birth weight distribution (N = 15,980)

	$\overline{x}\pm s$	Grouped by birth weight						Grouped by birth weight and gestational age
		< 2500 g		2500 ~ 4000 g		> 4000 g		SGA		AGA		LGA
		n	%	n	%	n	%	n	%	n	%	n	%
Area
Urban	3339.2 ± 461.6	607	3.8	14,542	91.0	831	5.2	1998	12.5	12,464	78.0	1518	9.5
Rural	3230.7 ± 451.0	943	5.9	14,462	90.5	575	3.6	2493	15.6	12,400	77.6	1087	6.8
Region
Southern Shaanxi Region	3263.7 ± 453.3	783	4.9	14,526	90.9	671	4.2	2397	15.0	12,353	77.3	1230	7.7
Northern Shaanxi Region	3290.3 ± 464.7	943	5.9	14,366	89.9	671	4.2	2525	15.8	12,400	77.6	1055	6.6
Middle Shaanxi Region	3252.6 ± 450.9	703	4.4	14,542	91.0	735	4.6	1966	12.3	12,752	79.8	1262	7.9
Total	3279.9 ± 454.6	783	4.9	14,494	90.7	703	4.4	2349	14.7	12,417	77.7	1214	7.6