condition mean min max ZT0-3 865.3499999999999 865.3499999999999 865.3499999999999 ZT4-7 1233.4 1233.4 1233.4 ZT8-11 1214.1999999999998 1214.1999999999998 1214.1999999999998 ZT12-15 1222.15 1222.15 1222.15 ZT16-19 1000.4000000000001 1000.4000000000001 1000.4000000000001 ZT20-23 881.25 881.25 881.25