condition mean min max ZT0-3 118.528719 118.528719 118.528719 ZT4-7 236.1842885 236.1842885 236.1842885 ZT8-11 294.265875 294.265875 294.265875 ZT12-15 232.43385899999998 232.43385899999998 232.43385899999998 ZT16-19 185.8466995 185.8466995 185.8466995 ZT20-23 139.966238 139.966238 139.966238