condition mean min max ZT0-3 59.398981 59.398981 59.398981 ZT4-7 45.464546 45.464546 45.464546 ZT8-11 48.257309 48.257309 48.257309 ZT12-15 65.53990350000001 65.53990350000001 65.53990350000001 ZT16-19 57.472433499999994 57.472433499999994 57.472433499999994 ZT20-23 54.314486 54.314486 54.314486