condition mean min max ZT0-3 167.86458 167.86458 167.86458 ZT4-7 222.866867 222.866867 222.866867 ZT8-11 238.39911 238.39911 238.39911 ZT12-15 246.15709199999998 246.15709199999998 246.15709199999998 ZT16-19 219.29546299999998 219.29546299999998 219.29546299999998 ZT20-23 245.97191399999997 245.97191399999997 245.97191399999997