condition mean min max ZT0-3 3.39329628625 2.9077271125 3.87886546 ZT4-7 0.8944219195 0.889940935 0.898902904 ZT8-11 0.82849276975 0.7690211525 0.887964387 ZT12-15 0.667287984 0.60918377 0.725392198 ZT16-19 1.22243291375 1.005924949 1.4389408785 ZT20-23 1.9041011605 1.8717905305 1.9364117905