condition mean min max ZT0-3 22.69745 22.6702 22.7247 ZT4-7 20.73105 20.73105 20.73105 ZT8-11 27.677500000000002 27.677500000000002 27.677500000000002 ZT12-15 0 0 0 ZT16-19 29.715049999999998 29.715049999999998 29.715049999999998 ZT20-23 19.0475 19.0475 19.0475