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Table 2 Comparison of BMI and environmental factors between the analyzed and nonanalyzed junior high school students

From: A retrospective cohort study on the association between poor sleep quality in junior high school students and high hemoglobin A1c level in early adults with higher body mass index values

 

Analyzed subjects

Non-analyzed subjects

p value

all (n = 99)

all (n = 442)

Mean

SD

Mean

SD

Sex (male), n (%)

46(46.5%)

211(47.7%)

0.819

Height (cm)

156.50

6.73

157.94

7.63

0.084

Weight (kg)

49.04

11.34

50.10

10.59

0.375

BMI (kg/m2)

19.87

3.42

19.98

3.41

0.764

Playing sports for > 1 year, n (%)a

85(85.90)

326(76.7%)

0.130

Snacking habitsb

2.08

0.74

1.93

0.72

0.064

Dinner companionc

2.89

0.45

2.84

0.50

0.416

Sleep durationd

3.19

0.98

3.17

1.14

0.836

Sleep qualitye

1.91

0.69

1.98

0.74

0.401

Psychological stressf

2.26

0.95

2.45

0.91

0.064

  1. The p values were from the Student t test for continuous variables and chi-square test for categorical variables. The p values < 0.05 are in bold. Continuous variables are presented as mean (SD). Abbreviation: BMI body mass index
  2. a1: yes, 2: no; b1: less than once a week, 2: every 2 or 3 days, 3: every day; c1: alone, 2: with siblings, 3: with family; d1: > 9 h, 2: 8–9 h, 3: 7–8 h, 4: 6–7 h, 5: 5–6 h, 6: < 5 h; e1: sufficient, 2: to some extent, 3: poor, 4: insufficient; f1: none at all, 2: little, 3: some, 4: much