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Table 1 Baseline characteristics of participants included and excluded from the cohort study

From: The relationship between physical activity, mental wellbeing and symptoms of mental health disorder in adolescents: a cohort study

Baseline characteristics

 

Excluded (n = 242*)

n (%)

Included (n = 673)

n (%)

Difference in proportion between excluded versus included categories**

Gender

Males

149 (31.1)

330 (68.9)

X2 = 11.21 (p = 0.001)

Females

93 (21.0)

343 (79.0)

Ethnicity

White

217 (25.7)

629 (74.3)

X2 = 3.67 (p = 0.06)

Other

25 (36.0)

44 (64.0)

FAS

Low and medium (0–5)

121 (25.5)

353 (74.5)

X2 = 2.09 (p = 0.15)

High (6–9)

87 (21.4)

320 (87.6)

Study school

1

40 (22.0)

142 (78.0)

X2 = 78.04 (p < 0.001)

2

58 (33.3)

116 (66.7)

3

31 (18.8)

134 (81.2)

4

15 (15.6)

81 (84.4)

5

28 (16.5)

142 (83.5)

6

70 (54.7)

58 (45.3)

Physical activity***

Volume (mean counts per minute)

482.78 (158.12)

508.28 (169.42)

−25.5 (95% CI −58.02 to 7.02) p = 0.12

MVPA (mean daily MVPA minutes)

51.90 (21.66)

55.59 (21.47)

−3.69 (95% CI −7.86 to 0.48) p = 0.08

  1. *13 pupils were excluded but did not have baseline characteristics data to compare
  2. **Pearson’s chi-squared tests
  3. ***Physical activity measures in excluded group n = 121 due to missing data (t-test mean difference)