condition mean min max ZT0-3 26.549999999999997 26.549999999999997 26.549999999999997 ZT4-7 24.2 24.2 24.2 ZT8-11 14.600000000000001 14.600000000000001 14.600000000000001 ZT12-15 18.2 18.2 18.2 ZT16-19 34.9 34.9 34.9 ZT20-23 21.65 21.65 21.65