condition mean min max ZT0-3 3.737405 3.33663 4.13818 ZT4-7 6.422625 6.422625 6.422625 ZT8-11 10.02542 10.02542 10.02542 ZT12-15 0 0 0 ZT16-19 6.75595 6.75595 6.75595 ZT20-23 5.666695000000001 5.666695000000001 5.666695000000001