condition mean min max ZT0-3 13.7446004475 11.31721902 16.171981875 ZT4-7 15.5897227525 15.058365405 16.1210801 ZT8-11 18.1853782125 16.352041155000002 20.01871527 ZT12-15 15.539693255 14.305828505000001 16.773558004999998 ZT16-19 17.3891213675 16.626372654999997 18.151870080000002 ZT20-23 11.998213634999999 11.31780367 12.6786236