condition mean min max ZT0-3 5.849673376749999 3.4109388330000003 8.2884079205 ZT4-7 3.13182908425 1.5433181275 4.720340041 ZT8-11 1.91747286025 1.8246262795 2.010319441 ZT12-15 6.1245085525 4.712472163 7.536544942 ZT16-19 13.17316086925 12.42718171 13.9191400285 ZT20-23 16.818387006000002 16.758865815 16.877908197