condition mean min max ZT0-3 2.1198173945 1.862494734 2.377140055 ZT4-7 2.7250615395000004 2.391708099 3.0584149800000002 ZT8-11 3.54433225525 3.3688681415 3.719796369 ZT12-15 3.20003792275 3.1901816309999997 3.2098942145000002 ZT16-19 3.234990379 2.613932247 3.856048511 ZT20-23 5.35583694 5.161594059 5.550079821