condition mean min max ZT0-3 329.230553475 308.8036624 349.65744455000004 ZT4-7 201.81344565 191.55822105 212.06867025 ZT8-11 87.022832425 64.54785136000001 109.49781349 ZT12-15 29.819916389999996 27.059840899999998 32.579991879999994 ZT16-19 32.9371710625 29.482547175 36.39179495 ZT20-23 62.2830453 52.31153548 72.25455511999999