Table 3. Association between sleep disorders and various risk factors.

*Chi-square test

Sleep disorder (SDSC score >39)			Number of patients (n = 450)					Percentage (%)
Present			153					34.0
Absent			297					66.0
Risk Factor	Number of patients (n = 450)	Sleep disorder			Odds ratio	95% confidence interval			P-value
		Present, n (%)		Absent, n (%)
Sleep problems in infancy
Present	32	20 (62.5)		12 (37.5)	3.5		1.6-7.5		0.002*
Absent	418	133 (31.9)		285 (68.1)
Siblings
Absent	189	77 (40.7)		112 (59.3)	1.6		1.1-2.4		0.007*
Present	261	76 (29.1)		185 (70.9)
Family history of sleep disorders
Present	17	10 (58.8)		7 (41.2)	2.8		1.0-7.7		0.029*
Absent	433	143 (33.0)		290 (67.0)
Parental presence while sleeping
Present	324	121 (37.3)		203 (62.7)	1.2		1.1-2.7		0.016*
Absent	126	32 (25.4)		94 (74.6)