condition mean min max ZT0-3 261.302174 261.302174 261.302174 ZT4-7 240.81370299999998 240.81370299999998 240.81370299999998 ZT8-11 220.0419635 220.0419635 220.0419635 ZT12-15 136.51994100000002 136.51994100000002 136.51994100000002 ZT16-19 232.89662850000002 232.89662850000002 232.89662850000002 ZT20-23 267.5980445 267.5980445 267.5980445