condition mean min max ZT0-3 11.99315 11.99315 11.99315 ZT4-7 19.0716 19.0716 19.0716 ZT8-11 18.84855 18.84855 18.84855 ZT12-15 15.724115 15.724115 15.724115 ZT16-19 11.77095 11.77095 11.77095 ZT20-23 10.625895 10.625895 10.625895