condition mean min max ZT0-3 40.369471 40.369471 40.369471 ZT4-7 44.596981 44.596981 44.596981 ZT8-11 44.094937 44.094937 44.094937 ZT12-15 42.0181275 42.0181275 42.0181275 ZT16-19 47.013873000000004 47.013873000000004 47.013873000000004 ZT20-23 48.1857325 48.1857325 48.1857325