condition mean min max ZT0-3 10.204698333333333 7.434895 12.938199999999998 ZT4-7 6.38596 6.38596 6.38596 ZT8-11 8.542175 8.542175 8.542175 ZT12-15 12.236125000000001 10.8946 13.57765 ZT16-19 12.7704 12.7704 12.7704 ZT20-23 15.468900000000001 15.468900000000001 15.468900000000001