condition mean min max ZT0-3 17.8 17.8 17.8 ZT4-7 45.4 45.4 45.4 ZT8-11 29.900000000000002 29.900000000000002 29.900000000000002 ZT12-15 24.0 24.0 24.0 ZT16-19 29.35 29.35 29.35 ZT20-23 33.8 33.8 33.8