condition mean min max ZT0-3 30.684677 30.684677 30.684677 ZT4-7 26.5691245 26.5691245 26.5691245 ZT8-11 36.589034999999996 36.589034999999996 36.589034999999996 ZT12-15 35.46653 35.46653 35.46653 ZT16-19 45.4659035 45.4659035 45.4659035 ZT20-23 34.7630735 34.7630735 34.7630735