condition mean min max ZT0-3 7.984825000000001 7.984825000000001 7.984825000000001 ZT4-7 5.596299999999999 5.596299999999999 5.596299999999999 ZT8-11 6.024055000000001 6.024055000000001 6.024055000000001 ZT12-15 7.709395000000001 7.709395000000001 7.709395000000001 ZT16-19 7.672829999999999 7.672829999999999 7.672829999999999 ZT20-23 7.387855 7.387855 7.387855