condition mean min max ZT0-3 10.829067 10.829067 10.829067 ZT4-7 11.4568765 11.4568765 11.4568765 ZT8-11 11.812932 11.812932 11.812932 ZT12-15 10.9755275 10.9755275 10.9755275 ZT16-19 10.7010215 10.7010215 10.7010215 ZT20-23 11.4647535 11.4647535 11.4647535