condition mean min max ZT0-3 24.644387 24.644387 24.644387 ZT4-7 23.9051065 23.9051065 23.9051065 ZT8-11 27.2696085 27.2696085 27.2696085 ZT12-15 26.9019645 26.9019645 26.9019645 ZT16-19 30.5265895 30.5265895 30.5265895 ZT20-23 29.675074000000002 29.675074000000002 29.675074000000002