condition mean min max ZT0-3 11.622625 11.0237 12.22155 ZT4-7 26.27295 26.27295 26.27295 ZT8-11 47.39145 47.39145 47.39145 ZT12-15 0 0 0 ZT16-19 31.22305 31.22305 31.22305 ZT20-23 21.93485 21.93485 21.93485