condition mean min max ZT0-3 23.45225 22.61645 24.8096 ZT4-7 21.91315 21.91315 21.91315 ZT8-11 23.2282 23.2282 23.2282 ZT12-15 26.64175 26.201999999999998 27.0815 ZT16-19 24.54325 24.54325 24.54325 ZT20-23 26.66155 26.66155 26.66155