condition mean min max ZT0-3 63.11893333333333 47.8568 74.1389 ZT4-7 26.071800000000003 26.071800000000003 26.071800000000003 ZT8-11 7.877560000000001 7.877560000000001 7.877560000000001 ZT12-15 8.394792500000001 8.297975000000001 8.49161 ZT16-19 7.378985 7.378985 7.378985 ZT20-23 16.94335 16.94335 16.94335