condition mean min max ZT0-3 297.453942 297.453942 297.453942 ZT4-7 262.335485 262.335485 262.335485 ZT8-11 294.3774115 294.3774115 294.3774115 ZT12-15 272.7985885 272.7985885 272.7985885 ZT16-19 453.909036 453.909036 453.909036 ZT20-23 376.2488115 376.2488115 376.2488115