condition mean min max ZT0-3 0.2484876405 0.0 0.496975281 ZT4-7 1.6955952859999999 0.5840036055 2.8071869664999998 ZT8-11 15.3496230415 8.7781881265 21.9210579565 ZT12-15 33.670061305000004 33.25620086 34.08392175 ZT16-19 13.618170739249999 10.3987978055 16.837543673 ZT20-23 3.29105507525 2.1271841335 4.454926017