Table 4. Association of season of birth and development outcomes of infants in poor rural Qinba mountainous area (N = 650).

Variables	Hb	MDI	PDI
Winter born infant (1 = yes; 0 = no)	3.63***	7.08***	12.19***
	(1.00)	(1.37)	(1.15)
Gender (1 = male; 0 = female)	0.76	2.94***	2.60**
	(0.89)	(1.03)	(1.04)
Infant age (month)	1.69**	-2.16***	-6.85***
	(0.69)	(0.81)	(0.73)
Infant was premature (1 = yes; 0 = no)	-2.94	-0.16	4.90***
	(2.93)	(3.26)	(1.74)
Mother is the primary caregiver (1 = yes; 0 = no)	-1.79	1.34	1.22
	(1.45)	(1.65)	(1.71)
Mother completed at least junior high school (1 = yes; 0 = no)	2.11	-0.96	0.67
	(1.31)	(1.53)	(1.41)
Maternal age (1 = more than 25 years old; 0 = else)	0.38	-0.71	-0.85
	(0.94)	(1.09)	(1.09)
Families receives Minimum Living Standard Guarantee (1 = yes; 0 = no)	0.22	-0.51	-2.00
	(1.19)	(1.32)	(1.34)

Note

*** p<0.01

** p<0.05

* p<0.1. Robust standard errors in parentheses clustered at village level.