condition mean min max ZT0-3 0.40950299999999995 0.3428555 0.4761505 ZT4-7 0.4441695 0.4441695 0.4441695 ZT8-11 0.263644 0.263644 0.263644 ZT12-15 0 0 0 ZT16-19 0.37684599999999996 0.37684599999999996 0.37684599999999996 ZT20-23 0.737438 0.737438 0.737438