condition mean min max ZT0-3 16.889699999999998 15.81435 18.6202 ZT4-7 12.3845 12.3845 12.3845 ZT8-11 12.17125 12.17125 12.17125 ZT12-15 22.52835 21.75725 23.29945 ZT16-19 21.3633 21.3633 21.3633 ZT20-23 21.7638 21.7638 21.7638