Table 2 Comparison of baseline data before and after propensity score matching between the two groups.

From: Mental health symptoms in Chinese children with sleep disorders and association with parental emotions

Characteristics

Before matching

After matching

SDG (n = 6,654)

NSDG (n = 47,834)

x2/z

P

SDG (n = 6,635)

NSDG (n = 6,635)

x2/z

P

Age (years, Mean ± SD)

12.90 ± 3.80

11.00 ± 3.63

39.18

< 0.01

12.90 ± 3.46

12.90 ± 3.68

-0.77

0.44

Gender

Male (n, %)

3,106 (46.7)

24,612 (51.5)

53.08

< 0.01

3,100 (46.7)

2,994 (45.1)

3.35

0.07

Female (n, %)

3,548 (53.3)

23,222 (48.5)

3,535 (53.3)

3,641 (54.9)

School Stage

        

Primary (n, %)

2,496 (37.5)

34,687 (72.5)

3,300.88

< 0.01

2,492 (37.6)

2,517 (37.9)

0.18

0.67

Junior High (n, %)

4,158 (62.5)

13,147 (27.5)

4,143 (62.4)

4,118 (62.1)

Area

Urban (n, %)

2,495 (37.5)

18,467 (38.6)

147.29

< 0.01

2,489 (37.5)

2,489 (37.5)

0

1

Town (n, %)

1,630 (24.5)

14,409 (30.1)

1,624 (24.5)

1,624 (24.5)

Village (n, %)

2,529 (38.0)

14,958 (31.3)

2,522 (38.0)

2,522 (38.0)

Only Child (n, %)

662 (9.9)

5,739 (12.0)

23.45

< 0.01

656 (9.9)

656 (9.9)

0

1

Parental depression (n, %)

809 (12.2)

5,844 (12.2)

0.14

0.71

806 (12.1)

825 (12.4)

0.01

0.94

Parental anxiety (n, %)

1,009 (15.2)

7,134 (14.9)

0.06

0.81

1,006 (15.2)

1,046 (15.8)

0.24

0.63

Parental stress (n, %)

423 (6.4)

2,943 (6.2)

0.20

0.65

422 (6.4)

390 (5.9)

1.96

0.16

Depression (n, %)

2,765 (41.6)

2,829 (5.9)

8,050.13

< 0.01

2,757 (41.6)

484 (7.3)

2,107.62

< 0.01

Anxiety (n, %)

3,038 (45.7)

3,001 (6.3)

9,189.64

< 0.01

3,030 (45.7)

529 (8.0)

2,399.98

< 0.01

Stress (n, %)

1,553 (23.3)

860 (1.8)

6,399.39

< 0.01

1,550 (23.4)

171 (2.6)

1,267.84

< 0.01

Life satisfaction

Satisfied

2,554 (38.4)

33,781 (70.6)

3,066.26

< 0.01

2,549 (38.4)

4,371 (65.9)

1,091.56

< 0.01

Neutral

1,085 (16.3)

5,430 (11.4)

1,079 (16.3)

867 (13.0)

Dissatisfied

3,015 (45.3)

8,623 (18.0)

3,007 (45.3)

1,397 (21.1)

Sleep duration (hours, Mean ± SD)

7.43 ± 2.14

9.05 ± 1.42

-59.88

< 0.01

7.43 ± 2.14

8.80 ± 1.54

-42.3

< 0.01

  1. NSDG non-sleep disorders group, SDG sleep disorders group, SD standard deviation, x2 was used to assess the difference between SDG and NSDG in proportions, z was employed to determine the statistical significance of the difference in means between two groups, P < 0.05 suggests there’s likely a significant difference between the two groups.
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