condition mean min max ZT0-3 13.0237375 11.020325 15.027149999999999 ZT4-7 3.49534 3.49534 3.49534 ZT8-11 3.11348 3.11348 3.11348 ZT12-15 0 0 0 ZT16-19 7.341234999999999 7.341234999999999 7.341234999999999 ZT20-23 11.7847 11.7847 11.7847