condition mean min max ZT0-3 1.78642554725 1.46369789 2.1091532045 ZT4-7 2.3296631037499997 2.3084280395 2.350898168 ZT8-11 6.5101330847500005 4.2606899915000005 8.759576178 ZT12-15 20.967861749 15.630277523 26.305445974999998 ZT16-19 22.1396935375 21.589665935 22.68972114 ZT20-23 25.62058073 24.962041595000002 26.279119865