condition mean min max ZT0-3 79.130472 79.130472 79.130472 ZT4-7 109.6155015 109.6155015 109.6155015 ZT8-11 192.973094 192.973094 192.973094 ZT12-15 179.3420275 179.3420275 179.3420275 ZT16-19 140.77601099999998 140.77601099999998 140.77601099999998 ZT20-23 98.00468599999999 98.00468599999999 98.00468599999999