condition mean min max ZT0-3 5.836928333333334 4.53583 6.722620000000001 ZT4-7 5.4896199999999995 5.4896199999999995 5.4896199999999995 ZT8-11 4.229495 4.229495 4.229495 ZT12-15 6.17542 5.38593 6.96491 ZT16-19 5.856335 5.856335 5.856335 ZT20-23 9.28938 9.28938 9.28938