condition mean min max ZT0-3 147.488764 147.488764 147.488764 ZT4-7 143.0140395 143.0140395 143.0140395 ZT8-11 147.28170899999998 147.28170899999998 147.28170899999998 ZT12-15 168.765518 168.765518 168.765518 ZT16-19 170.81541049999998 170.81541049999998 170.81541049999998 ZT20-23 161.05967149999998 161.05967149999998 161.05967149999998