condition mean min max ZT0-3 19.9052 19.9052 19.9052 ZT4-7 11.3028 11.3028 11.3028 ZT8-11 14.1547 14.1547 14.1547 ZT12-15 20.39145 20.39145 20.39145 ZT16-19 18.28235 18.28235 18.28235 ZT20-23 26.5462 26.5462 26.5462