condition mean min max ZT0-3 79.33135 68.2284 93.29560000000001 ZT4-7 64.134 64.134 64.134 ZT8-11 30.7516 30.7516 30.7516 ZT12-15 14.697700000000001 13.7711 15.6243 ZT16-19 11.27465 11.27465 11.27465 ZT20-23 35.26625 35.26625 35.26625