condition mean min max ZT0-3 9.495125000000002 9.495125000000002 9.495125000000002 ZT4-7 8.716999999999999 8.716999999999999 8.716999999999999 ZT8-11 5.9533249999999995 5.9533249999999995 5.9533249999999995 ZT12-15 6.45642 6.45642 6.45642 ZT16-19 10.5257 10.5257 10.5257 ZT20-23 7.44433 7.44433 7.44433