condition mean min max ZT0-3 30.228583333333333 15.3604 41.5025 ZT4-7 18.39985 18.39985 18.39985 ZT8-11 17.5471 17.5471 17.5471 ZT12-15 24.2776 20.1632 28.392 ZT16-19 33.314350000000005 33.314350000000005 33.314350000000005 ZT20-23 46.4939 46.4939 46.4939