I once did a short stint at a phone survey company that specialised in health and social welfare surveys. I wasn't on this particular survey crew, but I remember a colleague telling me that it was strange - a stranger rings up and with your consent conducts a 20-minute anonymous survery on the subject of abuse, sexual or otherwise, that the respondant suffered as a child.<p>It was a delicate survey and required a fair bit of rapport building, and <i>lots</i> of 'I need to remind you that the next question is voluntary'... but we were still getting plenty of respondants, and the weird thing was that despite being a (relatively) anonymous stranger with which you have just shared some sensitive, deep secrets about childhood abuse, the question that most balked at was the 'income level' question in the demographic rundown at the end.