Table 2

Characteristics of subjects with and without polysomnography

Composite score <7Composite score ≥7
PSGNo PSGp ValuePSGNo PSGp Value
n=209n=5647n=410n=181
Age, years9.2 (1.8)9.3 (1.8)0.4758.9 (1.7)8.7 (1.8)0.131
Height, cm133 (13)134 (13)0.332132 (13)131 (16)0.491
Weight, kg31.1 (9.1)30.9 (9.3)0.81531.5 (9.6)31.2 (10.0)0.720
Body mass index, kg/m217.2 (3.3)16.8 (3.0)0.11117.5 (3.3)17.7 (3.6)0.402
No of family members4.6 (1.2)4.6 (1.2)0.9684.4 (1.1)4.3 (1.1)0.402
No of siblings1.2 (0.9)1.3 (1.0)0.2671.0 (0.8)1.0 (0.9)0.974
Household area per person, sq ft123.8 (58.4)123.8 (55.5)0.995141.7 (59.7)137.2 (63.8)0.422
Family income, %0.1870.091
 ≤HK$10 00028.631.519.827.5
 HK$10 001–15 00019.422.920.320.8
 >HK$15 00051.945.659.951.7
Household area, %0.5050.181
 ≤400 sq ft35.632.323.329.9
 401–600 sq ft29.833.232.527.1
 >600 sq ft34.634.544.342.9
Paternal education, %0.590.151
 Primary or below19.019.510.114.7
 Secondary60.065.169.369.9
 Tertiary or above18.015.320.515.3
Maternal education, %0.9670.298
 Primary or below19.620.410.014.5
 Secondary70.669.977.072.7
 Tertiary or above9.89.713.012.7