condition mean min max ZT0-3 27.25 27.25 27.25 ZT4-7 52.3 52.3 52.3 ZT8-11 34.0 34.0 34.0 ZT12-15 42.65 42.65 42.65 ZT16-19 41.0 41.0 41.0 ZT20-23 24.15 24.15 24.15