condition mean min max ZT0-3 41.886489277500004 41.247145555 42.525833 ZT4-7 57.87585234 53.48558124 62.26612344 ZT8-11 52.859546315 52.05959666 53.65949597 ZT12-15 46.366779001666664 44.45259528333333 48.28096272 ZT16-19 45.260200975000004 44.28764264666667 46.23275930333333 ZT20-23 41.55483373 37.453651953333335 45.65601550666667