condition mean min max ZT0-3 1022.0999999999999 1022.0999999999999 1022.0999999999999 ZT4-7 820.6 820.6 820.6 ZT8-11 881.9000000000001 881.9000000000001 881.9000000000001 ZT12-15 872.05 872.05 872.05 ZT16-19 1127.1 1127.1 1127.1 ZT20-23 1089.95 1089.95 1089.95