condition mean min max ZT0-3 161.89066666666668 143.5805 196.164 ZT4-7 179.45850000000002 179.45850000000002 179.45850000000002 ZT8-11 36.103049999999996 36.103049999999996 36.103049999999996 ZT12-15 101.4998 45.8061 157.1935 ZT16-19 63.5487 63.5487 63.5487 ZT20-23 88.87465 88.87465 88.87465