condition mean min max ZT0-3 35.8 35.8 35.8 ZT4-7 26.5 26.5 26.5 ZT8-11 30.1 30.1 30.1 ZT12-15 16.900000000000002 16.900000000000002 16.900000000000002 ZT16-19 29.7 29.7 29.7 ZT20-23 44.45 44.45 44.45