condition mean min max ZT0-3 39.052783 39.052783 39.052783 ZT4-7 44.3984475 44.3984475 44.3984475 ZT8-11 49.379407 49.379407 49.379407 ZT12-15 35.8821755 35.8821755 35.8821755 ZT16-19 40.466912 40.466912 40.466912 ZT20-23 45.4651795 45.4651795 45.4651795