condition mean min max ZT0-3 5.269978333333333 5.076264999999999 5.654025 ZT4-7 4.15305 4.15305 4.15305 ZT8-11 3.98738 3.98738 3.98738 ZT12-15 4.9194249999999995 4.8774999999999995 4.9613499999999995 ZT16-19 4.926185 4.926185 4.926185 ZT20-23 6.1221499999999995 6.1221499999999995 6.1221499999999995