condition mean min max ZT0-3 1175.1999999999998 1175.1999999999998 1175.1999999999998 ZT4-7 714.9 714.9 714.9 ZT8-11 780.1500000000001 780.1500000000001 780.1500000000001 ZT12-15 987.3 987.3 987.3 ZT16-19 1030.7 1030.7 1030.7 ZT20-23 1191.75 1191.75 1191.75