condition mean min max ZT0-3 190.539749 190.539749 190.539749 ZT4-7 205.9378745 205.9378745 205.9378745 ZT8-11 222.9697645 222.9697645 222.9697645 ZT12-15 271.138124 271.138124 271.138124 ZT16-19 293.552163 293.552163 293.552163 ZT20-23 260.336299 260.336299 260.336299