condition mean min max ZT0-3 104.363475 104.363475 104.363475 ZT4-7 149.1762735 149.1762735 149.1762735 ZT8-11 131.4902105 131.4902105 131.4902105 ZT12-15 170.79305 170.79305 170.79305 ZT16-19 220.88804399999998 220.88804399999998 220.88804399999998 ZT20-23 165.40249949999998 165.40249949999998 165.40249949999998