condition mean min max ZT0-3 3.09403 2.730455 3.457605 ZT4-7 5.965065 5.965065 5.965065 ZT8-11 6.71349 6.71349 6.71349 ZT12-15 0 0 0 ZT16-19 5.836185 5.836185 5.836185 ZT20-23 5.406055 5.406055 5.406055