condition mean min max ZT0-3 34.062953 34.062953 34.062953 ZT4-7 28.930048499999998 28.930048499999998 28.930048499999998 ZT8-11 28.765943 28.765943 28.765943 ZT12-15 28.8660735 28.8660735 28.8660735 ZT16-19 110.95714000000001 110.95714000000001 110.95714000000001 ZT20-23 96.17520400000001 96.17520400000001 96.17520400000001