Multivariable logistic regression model of significant health behaviour markers and probability of ever being PCR tested for SARS-CoV-2 between 1 March 2020 and 31 August 2021, accounting for baseline age, sex and deprivation, and clustered by school
| PCR tested for SARS-CoV-2 (n=6403, R2=0.02) | OR | P value | 95% CI |
| Ate breakfast Reference: did not eat breakfast | 1.16* 1.00 | 0.067 | 0.99 to 1.36 |
| Actively travelled to school Reference: did not actively travel to school | 0.93 1.00 | 0.339 | 0.80 to 1.08 |
| Actively travelled from school Reference: did not actively travel from school | 1.01 1.00 | 0.901 | 0.86 to 1.19 |
| Number of fruit/vegetable portions | 1.00 | 0.959 | 0.97 to 1.03 |
| Number of times teeth brushed | 0.94 | 0.229 | 0.86 to 1.04 |
| Sleep hours | 1.01 | 0.682 | 0.97 to 1.04 |
| Reference: 0 days physically active ≥60 min (previous 7 days) | |||
| 1–2 days physically active ≥60 min | 1.14 | 0.250 | 0.91 to 1.41 |
| 3–4 days physically active ≥60 min | 1.13 | 0.257 | 0.91 to 1.39 |
| 5–6 days physically active ≥60 min | 1.16 | 0.217 | 0.92 to 1.45 |
| 7 days physically active ≥60 min | 1.10 | 0.451 | 0.86 to 1.39 |
| Reference: 0 days sedentary ≥2 hours (previous 7 days) | 1.00 | ||
| 1–2 days sedentary ≥2 hours | 1.20 | 0.141 | 0.94 to 1.54 |
| 3–4 days sedentary ≥2 hours | 1.18 | 0.198 | 0.92 to 1.52 |
| 5–6 days sedentary ≥2 hours | 1.16 | 0.333 | 0.86 to 1.56 |
| 7 days sedentary ≥2 hours | 1.16 | 0.243 | 0.90 to 1.48 |
| Reference: 0 days felt tired (previous 7 days) | 1.00 | ||
| 1–2 days felt tired | 0.97 | 0.686 | 0.84 to 1.12 |
| 3–4 days felt tired | 1.00 | 0.963 | 0.85 to 1.16 |
| 5–6 days felt tired | 1.07 | 0.528 | 0.86 to 1.33 |
| 7 days felt tired | 0.97 | 0.728 | 0.83 to 1.14 |
| Reference: 0 days consumed sugary snack (previous 7 days) | 1.00 | ||
| 1–2 days consumed sugary snack | 1.24** | 0.018 | 1.04 to 1.49 |
| 3–4 days consumed sugary snack | 1.12 | 0.301 | 0.91 to 1.37 |
| 5–6 days consumed sugary snack | 1.31** | 0.008 | 1.07 to 1.61 |
| 7 days consumed sugary snack | 1.16 | 0.170 | 0.94 to 1.43 |
| Number of out-of-school club participations | 1.02* | 0.099 | 1.00 to 1.04 |
| Can ride a bike Reference: cannot ride a bike | 1.15* 1.00 | 0.086 | 0.98 to 1.35 |
| Can swim 25 m Reference: cannot swim 25 m | 1.21** 1.00 | 0.006 | 1.06 to 1.39 |
| Age on 1 March 2020 | 1.25** | < 0.001 | 1.16 to 1.35 |
| Sex (girl) Reference: sex (boy) | 0.92 1.00 | 0.161 | 0.81 to 1.04 |
| Reference: WIMD 2019 quintile 1 (Most deprived) | 1.00 | ||
| WIMD 2019 quintile 2 | 0.95 | 0.600 | 0.80 to 1.14 |
| WIMD 2019 quintile 3 | 0.85* | 0.090 | 0.70 to 1.03 |
| WIMD 2019 quintile 4 | 0.87 | 0.131 | 0.73 to 1.04 |
| WIMD 2019 quintile 5 (Least deprived) | 0.85* | 0.078 | 0.72 to 1.02 |
*P<0.1; **p<0.05.
See online supplemental appendix 4 for variable codebook. Low to moderate correlation between variables (coefficients −0.19 to 0.71). Complete case analysis.
WIMD, Welsh Index of Multiple Deprivation.