condition mean min max ZT0-3 4.06272 4.06272 4.06272 ZT4-7 4.025980000000001 4.025980000000001 4.025980000000001 ZT8-11 3.578895 3.578895 3.578895 ZT12-15 4.174015000000001 4.174015000000001 4.174015000000001 ZT16-19 4.329695 4.329695 4.329695 ZT20-23 3.96299 3.96299 3.96299