condition mean min max ZT0-3 1545.18425875 1430.4856395000002 1659.882878 ZT4-7 1318.537543 1176.195504 1460.879582 ZT8-11 1285.725728 1261.6514634999999 1309.7999925 ZT12-15 2515.547651 1983.784818 3047.310484 ZT16-19 3076.2035575 2983.6526775 3168.7544374999998 ZT20-23 2253.64502475 2162.7293845000004 2344.560665