condition mean min max ZT0-3 1.8287784999999999 0.8080575 3.374225 ZT4-7 3.01216 3.01216 3.01216 ZT8-11 0.949553 0.949553 0.949553 ZT12-15 1.8484775000000002 1.504185 2.1927700000000003 ZT16-19 1.43582 1.43582 1.43582 ZT20-23 0.9770430000000001 0.9770430000000001 0.9770430000000001