Table 6 Conditional logistic regression for short stature and related factors

Children

Child weight (kg)

0.92 (0.88, 0.96)

0.00

0.92 (0.86, 0.99)

0.02

Maternal height (cm)

0.77 (0.72, 0.83)

0.00

0.79 (0.72, 0.87)

0.00

Maternal weight (kg)

0.95 (0.92, 0.98)

0.00

1.02 (0.96, 1.08)

0.50

Paternal height (cm)

0.77 (0.72, 0.82)

0.00

0.83 (0.75, 0.91)

0.00

Paternal weight (kg)

0.94 (0.91, 0.96)

0.00

1.01 (0.96, 1.06)

0.75

Barbecued food

No

1

1

Yes

0.56 (0.34, 0.91)

0.02

0.59 (0.24, 1.43)

0.24

Foreign fast food

No

1

1

Yes

0.48 (0.28, 0.81)

0.01

0.52 (0.20, 1.38)

0.19

Children sleep habits

Night sleep (24 h)

0.72 (0.52, 1.01)

0.06

0.48 (0.26, 0.89)

0.02

Wakeup at night

Not at all

1

1

Once

1.44 (0.85, 2.45)

0.17

0.66 (0.27, 1.61)

0.36

2 times

NA

NA

≥ 3 times

1.61 (0.26, 9.85)

0.61

1.66 (0.03, 103.08)

0.81

Child snore

Never

1

1

Only on cold or allergy

0.55 (0.29, 1.05)

0.07

0.88 (0.30, 2.60)

0.82

Sometimes

0.72 (0.41, 1.27)

0.26

1.17 (0.46, 2.93)

0.75

Always

3.13 (0.55, 17.90)

0.20

0.86 (0.04, 17.36)

0.92

Child’s time spent on screening devices

Never

1

1

< 30 min

2.75 (1.02, 7.40)

0.05

2.95 (0.56, 15.44)

0.20

30–60 min

2.16 (0.82, 5.69)

0.12

4.05 (0.83, 19.63)

0.08

1–2 h

2.93 (1.06, 8.11)

0.04

3.37 (0.58, 19.66)

0.18

> 2 h

6.44 (1.63, 25.51)

0.01

3.76 (0.36, 39.44)

0.27

Child’s time spent outdoors

None

NA

NA

Rarely

1

1

Often but < 1 h

0.33 (0.16, 0.69)

0.00

0.34 (0.09, 1.30)

0.12

1–3 h

0.34 (0.16, 0.74)

0.01

0.45 (0.12, 1.75)

0.25

> 3 h

0.17 (0.03, 0.90)

0.04

0.02 (0.00, 0.66)

0.03