condition mean min max ZT0-3 59.537186952499994 47.912826474999996 71.16154743 ZT4-7 11.596407775 11.461515455 11.731300095 ZT8-11 10.980415473999999 9.666173976 12.294656971999999 ZT12-15 5.97784376875 4.5277257465 7.4279617909999995 ZT16-19 5.8068275730000005 5.284076108500001 6.3295790375 ZT20-23 9.500987444749999 8.773244745 10.2287301445