condition mean min max ZT0-3 13.200000000000001 13.200000000000001 13.200000000000001 ZT4-7 10.5 10.5 10.5 ZT8-11 27.35 27.35 27.35 ZT12-15 46.55 46.55 46.55 ZT16-19 69.3 69.3 69.3 ZT20-23 38.6 38.6 38.6