condition mean min max ZT0-3 35.950744 35.950744 35.950744 ZT4-7 37.669557 37.669557 37.669557 ZT8-11 40.2690615 40.2690615 40.2690615 ZT12-15 46.435764500000005 46.435764500000005 46.435764500000005 ZT16-19 46.893169 46.893169 46.893169 ZT20-23 40.972678 40.972678 40.972678