Table 4.
Observational multivariable analysis of the effect of BMI and WHR jointly on yearly hospital admission rate in UK Biobank participants of White British ancestry (N = 310471). Rates and 95% confidence intervals (95% CI) are given. Estimates are provided per exposure SD (SDBMI=4.74 and SDWHR=0.090).
| Observational (unadjusted) | Observational (adjusteda) | |
|---|---|---|
| Rateb 95% CI | Rateb 95% CI | |
| BMI (SD) | 1.084 (1.068–1.100) | 1.029 (1.015–1.043) |
| WHR (SD) | 1.155 (1.137–1.173) | 1.141 (1.120–1.163) |
BMI = body mass index, CI = confidence interval, SD = standard deviation, WHR = waist hip ratio
a) The observational analysis regresses the outcome directly on the exposures BMI and WHR simultaneously. The Poisson regression is adjusted for sex (categorical), age at study entry, alcohol frequency (categorical, from on a daily basis to never), employment (categorical), qualifications (categorical), Townsend deprivation score (categorical in quintiles, where 1 is not deprived and 5 is very deprived), and days of exercise per week (categorical, from 1 to 7).
b) Estimates (with corresponding 95% CIs) represent the fold increase in yearly hospital admission rate per BMI SD (4.74 kg/m2) and per WHR SD (0.090). Estimates per BMI and WHR unit are given in Table S3