condition mean min max ZT0-3 29.140666666666668 24.5465 38.12265 ZT4-7 46.798500000000004 46.798500000000004 46.798500000000004 ZT8-11 28.90225 28.90225 28.90225 ZT12-15 24.912999999999997 24.509099999999997 25.3169 ZT16-19 22.195149999999998 22.195149999999998 22.195149999999998 ZT20-23 23.681600000000003 23.681600000000003 23.681600000000003