Of the 72 156 potential person‐observations captured over seven phases of follow‐up, 4.8% (n = 3432) were missing due to mortality and 18.8% (n = 13 563) were lost to follow‐up. Of the 55 161 valid person‐observations, 0.9% (n = 481) were missing due to item non‐response at baseline and 3.3% (n = 1823) missing due to missing volume data between phases.
