Psychiatric disorders in term-born children with marginally low birth weight: a population-based study

Table 1 Demographic characteristics before matching

Variables	MLBW	No MLBW	p value
	n = 53,276 (%)	n = 1,323,930 (%)
Sex			< 0.0001^a
Female	32,080 (60.21)	634,531 (47.93)
Male	21,196 (39.79)	689,399 (52.07)
Age^c
Mean ± SD	3.27 + 2.31	3.39 + 2.32	<0.0001^b
Economic status			< 0.0001^a
Low income	3785 (7.10)	66,293 (5.01)
Confounders
Blindness and low vision	3 (0.01)	26 (0.002)	0.0705^a
Epilepsy	241 (0.45)	3101 (0.23)	< 0.0001^a
Fetal and neonatal hemorrhage	35 (0.06)	236 (0.02)	< 0.0001^a
Communicating hydrocephalus	10 (0.02)	83 (0.01)	0.0006^a
Intrauterine hypoxia and birth asphyxia	38 (0.07)	201 (0.02)	< 0.0001^a
Other perinatal jaundice	54 (0.10)	714 (0.05)	< 0.0001^a
Microcephalus	35 (0.07)	123 (0.01)	< 0.0001^a
Patent ductus arteriosus	459 (0.86)	3069 (0.23)	< 0.0001^a
Pneumonia	1707 (3.20)	36,133 (2.73)	< 0.0001^a
Pneumothorax	9 (0.02)	135 (0.01)	0.1383^a
Other respiratory conditions of fetus and newborn	338 (0.63)	1593 (0.12)	< 0.0001^a

MLBW marginally low birthweight, defined as term-born infants with birth weight between 2000 and 2499 g. No MLBW: term-born infants with birth weight ≥ 2500 g
^aChi-squared test
^bt-test
^cAge was calculated using 2013/12/31 as the time point to minus the date of birth

ISSN: 1753-2000