condition mean min max ZT0-3 49.202307285833335 37.857995215 60.54661935666667 ZT4-7 71.29242548666667 69.92037327999999 72.66447769333334 ZT8-11 71.24608256833332 69.96116256666666 72.53100257 ZT12-15 71.58677897499999 69.91802043999999 73.25553751 ZT16-19 71.848458165 67.99766699333333 75.69924933666667 ZT20-23 61.27206435 60.00519943 62.538929270000004