condition mean min max ZT0-3 25.474249999999998 23.44325 27.50525 ZT4-7 17.10085 17.10085 17.10085 ZT8-11 16.8464 16.8464 16.8464 ZT12-15 0 0 0 ZT16-19 12.47055 12.47055 12.47055 ZT20-23 16.65205 16.65205 16.65205