condition mean min max ZT0-3 65.6 65.6 65.6 ZT4-7 37.8 37.8 37.8 ZT8-11 38.0 38.0 38.0 ZT12-15 52.0 52.0 52.0 ZT16-19 66.30000000000001 66.30000000000001 66.30000000000001 ZT20-23 68.25 68.25 68.25