Table 2. Univariate analysis for gender, race, suicide attempts, age of admission, household income, and household size comparing the child abuse and the influenza infected groups.

	Child abuse	Influenza infection
	N (%)/M(SD)	N (%)/M(SD)	p	OR/difference (95% CI)
Gender			< .001	1.36
Female	6,304	18,923		(1.30, 1.41)
	(52.5%)	(44.9%)
Male	5,710	23,236
	(47.5%)	(55.1%)
Race			< .001	1.59
Chinese	11,036	37,411		(1.48, 1.72)
	(91.9%)	(88.7%)
Non-Chinese	879	4,748
	(8.1%)	(11.3%)
Suicide attempts			< .001	12.2
Yes	445	133		(10.0, 14.8)
	(3.7%)	(0.3%)
No	11,569	42,026
	(96.3%)	(99.7%)
Timing of attempted suicide (years)			.001	1.6
Mean (SD)	4.8	6.4		(0.7, 2.6)
	(4.7)	(5.1)
Age of admission (years)			< .001	4.2
Mean (SD)	8.3	4.1		(4.1, 4.3)
	(4.5)	(3.9)
Household income (HK$)			< .001	1046.8
Mean (SD)	24,427.8	25,474.6		(955.6, 1138.0)
	(4190.8)	(23.3)
Household size (no. of persons)			< .001	0.012
Mean (SD)	2.89	2.90		(0.009, 0.015)
	(0.132)	(0.138)