condition mean min max ZT0-3 91.522234 91.522234 91.522234 ZT4-7 104.5325725 104.5325725 104.5325725 ZT8-11 133.113549 133.113549 133.113549 ZT12-15 98.22600750000001 98.22600750000001 98.22600750000001 ZT16-19 100.0299685 100.0299685 100.0299685 ZT20-23 80.2120415 80.2120415 80.2120415