condition mean min max ZT0-3 31.324766666666665 28.911949999999997 34.63475 ZT4-7 24.95955 24.95955 24.95955 ZT8-11 25.3926 25.3926 25.3926 ZT12-15 27.54735 26.73085 28.36385 ZT16-19 26.263849999999998 26.263849999999998 26.263849999999998 ZT20-23 28.61195 28.61195 28.61195