condition mean min max ZT0-3 33.675277 33.675277 33.675277 ZT4-7 27.394199 27.394199 27.394199 ZT8-11 31.438982 31.438982 31.438982 ZT12-15 38.5693645 38.5693645 38.5693645 ZT16-19 39.2894045 39.2894045 39.2894045 ZT20-23 37.966794 37.966794 37.966794