condition mean min max ZT0-3 57.6 57.6 57.6 ZT4-7 27.4 27.4 27.4 ZT8-11 39.15 39.15 39.15 ZT12-15 55.7 55.7 55.7 ZT16-19 65.25 65.25 65.25 ZT20-23 74.65 74.65 74.65