condition mean min max ZT0-3 15.5983 15.5983 15.5983 ZT4-7 12.145150000000001 12.145150000000001 12.145150000000001 ZT8-11 15.11365 15.11365 15.11365 ZT12-15 16.1478 16.1478 16.1478 ZT16-19 18.25295 18.25295 18.25295 ZT20-23 18.18075 18.18075 18.18075