condition mean min max ZT0-3 25.15 25.15 25.15 ZT4-7 25.7 25.7 25.7 ZT8-11 17.599999999999998 17.599999999999998 17.599999999999998 ZT12-15 18.7 18.7 18.7 ZT16-19 16.6 16.6 16.6 ZT20-23 49.3 49.3 49.3