condition mean min max ZT0-3 86.924525 86.924525 86.924525 ZT4-7 84.318049 84.318049 84.318049 ZT8-11 77.2110905 77.2110905 77.2110905 ZT12-15 88.4018205 88.4018205 88.4018205 ZT16-19 90.5227215 90.5227215 90.5227215 ZT20-23 99.1280665 99.1280665 99.1280665