condition mean min max ZT0-3 379.361595 379.361595 379.361595 ZT4-7 286.687897 286.687897 286.687897 ZT8-11 218.2576665 218.2576665 218.2576665 ZT12-15 271.85713450000003 271.85713450000003 271.85713450000003 ZT16-19 187.1224515 187.1224515 187.1224515 ZT20-23 205.676492 205.676492 205.676492