condition mean min max ZT0-3 14.291988333333332 9.785165 17.6633 ZT4-7 7.81673 7.81673 7.81673 ZT8-11 9.65522 9.65522 9.65522 ZT12-15 12.42215 10.9297 13.9146 ZT16-19 32.1541 32.1541 32.1541 ZT20-23 27.88175 27.88175 27.88175