condition mean min max ZT0-3 26.2 26.2 26.2 ZT4-7 76.6 76.6 76.6 ZT8-11 79.75 79.75 79.75 ZT12-15 47.949999999999996 47.949999999999996 47.949999999999996 ZT16-19 61.5 61.5 61.5 ZT20-23 71.75 71.75 71.75