condition mean min max ZT0-3 118.69465 104.0083 133.381 ZT4-7 51.6278 51.6278 51.6278 ZT8-11 37.5897 37.5897 37.5897 ZT12-15 0 0 0 ZT16-19 65.55005 65.55005 65.55005 ZT20-23 67.72465 67.72465 67.72465