Association of perinatal factors with suspected developmental delay in urban children aged 1–36 months - a large-scale cross-sectional study in China

Table 1 Sociodemographic characteristics of the sample

Characteristics		Number (%) or mean (± SD)^a
Gender	Female	82,095 (46.1)
Gender	Male	96,140 (53.9)
Age	1–12 months	121,987(68.4)
	13–24 months	34,950 (19.6)
	25–36 months	21,298 (11.9)
Region	11 provinces	163,855(91.9)
	3 autonomous areas	10,780(6.0)
	1 municipality	3600(2.0)
Birth weight		3.39 ± 0.45^a
Birth length		50.19 ± 1.45^a
Nutritional status at birth	Normal	165,833 (93.0)
	Malnutrition	7700 (4.3)
	Obesity	4702 (2.6)
Head circumference at physical examination	Normal	168,544(94.5)
	Macrocephaly	7084 (4.0)
	Microcephaly	2607 (1.5)
Nutritional status at physical examination	Normal	164,779(92.5)
	Malnutrition	1823 (1.0)
	Obesity	11,633 (6.5)
Developmental delay	Overall neurodevelopmental delay	8068 (4.5)
	Gross motor delay	9014 (5.1)
	Fine motor delay	8786 (4.9)
	Language developmental delay	10,769 (6.0)

ISSN: 1471-2431