condition mean min max ZT0-3 79.55285 79.55285 79.55285 ZT4-7 48.583 48.583 48.583 ZT8-11 28.0197 28.0197 28.0197 ZT12-15 29.223950000000002 29.223950000000002 29.223950000000002 ZT16-19 66.24635 66.24635 66.24635 ZT20-23 72.53129999999999 72.53129999999999 72.53129999999999