condition mean min max ZT0-3 62.733022855 60.34812253 65.11792318 ZT4-7 29.5285228775 26.649132774999998 32.40791298 ZT8-11 24.311929565 23.423731425 25.200127705 ZT12-15 16.9656968775 15.269923890000001 18.661469865 ZT16-19 27.5091806125 21.291238545 33.72712268 ZT20-23 59.00357119 49.810322334999995 68.19682004500001