condition mean min max ZT0-3 31.049999999999997 31.049999999999997 31.049999999999997 ZT4-7 40.5 40.5 40.5 ZT8-11 29.450000000000003 29.450000000000003 29.450000000000003 ZT12-15 11.15 11.15 11.15 ZT16-19 20.5 20.5 20.5 ZT20-23 26.099999999999998 26.099999999999998 26.099999999999998