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They were followed regularly with questionnaires and biometric measurements .

研究人员定期对她们进行问卷调查和计量生物学测量。

None of these measurements is perfect .

这些衡量方法都不完美。

Knee angles were determined using standard measurements called the intercondylar and intermalleolar ( ic-im ) distances .

膝关节角度是根据髁间和踝间（ic-im）距离的标准量度进行判定的。

The measurements have been made with great exactitude .

这个测量的方法是非常严格，非常精确的。

But they also have some very precise gps positions and timing measurements .

但他们同时还有非常精确的gps定位及定时测量。