condition mean min max ZT0-3 8.9155598575 8.109024396 9.722095319 ZT4-7 22.184866722499997 15.94818411 28.421549334999998 ZT8-11 42.1311336625 35.350932955 48.91133437 ZT12-15 35.694076555 29.78413248 41.60402063 ZT16-19 28.248870975 25.719383604999997 30.778358345 ZT20-23 34.819590129999995 30.631964785 39.007215474999995