condition mean min max ZT0-3 0.56072959675 0.38904901449999996 0.732410179 ZT4-7 0.57480678325 0.555220606 0.5943929605 ZT8-11 1.112441521 0.852960315 1.371922727 ZT12-15 2.372262455 1.495966686 3.248558224 ZT16-19 2.78660072725 2.5896359010000003 2.9835655535 ZT20-23 2.7224547865 2.6864174405 2.7584921325