condition mean min max ZT0-3 22.8333 22.8333 22.8333 ZT4-7 20.755850000000002 20.755850000000002 20.755850000000002 ZT8-11 24.40675 24.40675 24.40675 ZT12-15 22.291600000000003 22.291600000000003 22.291600000000003 ZT16-19 24.05265 24.05265 24.05265 ZT20-23 19.51755 19.51755 19.51755