condition mean min max ZT0-3 121.18033333333334 100.53399999999999 146.606 ZT4-7 140.5375 140.5375 140.5375 ZT8-11 174.99849999999998 174.99849999999998 174.99849999999998 ZT12-15 150.57524999999998 139.838 161.3125 ZT16-19 127.2355 127.2355 127.2355 ZT20-23 93.68315 93.68315 93.68315