Wow! How does one use ‘visual analogue scale’ over the phone?

But, apparently, that is the least of the problems of this study of sexuality in West European menopausal women.
BTW, a “visual analogue scale” looks like this:

You jot a mark where you feel is the best spot that reflects your answer. The researcher than uses the ruler to put a number on it. Perhaps once iPhone is out in July, this kind of research will be possible.