condition mean min max ZT0-3 41.4892 41.4892 41.4892 ZT4-7 31.170749999999998 31.170749999999998 31.170749999999998 ZT8-11 35.117000000000004 35.117000000000004 35.117000000000004 ZT12-15 56.7235 56.7235 56.7235 ZT16-19 51.238299999999995 51.238299999999995 51.238299999999995 ZT20-23 53.10505 53.10505 53.10505