condition mean min max ZT0-3 11.5747 11.5747 11.5747 ZT4-7 7.594149999999999 7.594149999999999 7.594149999999999 ZT8-11 10.022314999999999 10.022314999999999 10.022314999999999 ZT12-15 11.43795 11.43795 11.43795 ZT16-19 18.5745 18.5745 18.5745 ZT20-23 17.706733333333332 17.706733333333332 17.706733333333332