condition mean min max ZT0-3 38.5567382 24.80961634 52.30386006 ZT4-7 62.283913301666665 54.58378379 69.98404281333333 ZT8-11 67.79888996 64.34184662 71.2559333 ZT12-15 95.14765506 80.36566397666667 109.92964614333334 ZT16-19 82.52192639833333 78.9216095 86.12224329666667 ZT20-23 66.36779675666666 59.01425857 73.72133494333333