condition mean min max ZT0-3 60.137097 60.137097 60.137097 ZT4-7 119.204205 119.204205 119.204205 ZT8-11 126.246516 126.246516 126.246516 ZT12-15 92.1469655 92.1469655 92.1469655 ZT16-19 69.456075 69.456075 69.456075 ZT20-23 62.164816 62.164816 62.164816