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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**
GenderMales149 (31.1)330 (68.9)X2 = 11.21 (p = 0.001)
Females93 (21.0)343 (79.0)
EthnicityWhite217 (25.7)629 (74.3)X2 = 3.67 (p = 0.06)
Other25 (36.0)44 (64.0)
FASLow 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 school140 (22.0)142 (78.0)X2 = 78.04 (p < 0.001)
258 (33.3)116 (66.7)
331 (18.8)134 (81.2)
415 (15.6)81 (84.4)
528 (16.5)142 (83.5)
670 (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)