condition mean min max ZT0-3 53.490525000000005 44.998400000000004 61.98265 ZT4-7 21.5897 21.5897 21.5897 ZT8-11 13.48195 13.48195 13.48195 ZT12-15 0 0 0 ZT16-19 24.3018 24.3018 24.3018 ZT20-23 34.284 34.284 34.284