Interaction analysis: adjusted linear regression models showing the associations between continuous measures of total accumulated moderate-to-vigorous-intensity physical activity (MVPA) time and body mass index (BMI) with glycated haemoglobin (HbA1c) stratified by MVPA and BMI levels
| p Value of MVPA × BMI interaction term | Stratification | HbA1c (dual units) | MVPA (30 min/day) | BMI (1 kg/m2) | ||
|---|---|---|---|---|---|---|
| Beta (99% CI)* | p Value | Beta (99% CI)† | p Value | |||
| 0.004 | BMI<30.0 kg/m2 | (mmol/mol) (%) | −0.7 (−1.2 to −0.1) −0.06 (−0.11 to −0.01) | 0.002 | – | – |
| BMI≥30.0 kg/m2 | (mmol/mol) (%) | −1.5 (−2.3 to −0.6) −0.13 (−0.21 to −0.05) | <0.001 | – | – | |
| MVPA<150 mins/week | (mmol/mol) (%) | – | – | 0.2 (0.1 to 0.3) 0.02 (0.01 to 0.03) | <0.001 | |
| MVPA≥150 mins/week | (mmol/mol) (%) | – | – | 0.2 (0.1 to 0.3) 0.02 (0.01 to 0.03) | <0.001 | |
All analyses controlled for primary sampling units, clustering and survey weights. Bold indicates statistical significance at p<0.01. Models adjusted for: age, ethnicity, income, sex, any prescribed medication and accelerometer wear-time.
*Beta coefficients represent the average difference in HbA1c (mmol/mol) (%) for each 30 min/day increment in MVPA.
†Beta coefficients represent the average difference in HbA1c (mmol/mol) (%) for each 1 kg/m2 increment in BMI.