condition mean min max ZT0-3 84.954766 84.954766 84.954766 ZT4-7 114.169493 114.169493 114.169493 ZT8-11 137.2993585 137.2993585 137.2993585 ZT12-15 139.3448465 139.3448465 139.3448465 ZT16-19 104.55749700000001 104.55749700000001 104.55749700000001 ZT20-23 116.417881 116.417881 116.417881