Ron,
correct, there are other factors to consider. The best analysis of voting patterns I have come across is by Professor John Curtice of Strathclyde University:-
So Who Voted Yes and Who Voted No? - What Scotland Thinks
From this lengthy article:-
"Between them the two exercises confirm the presence of four patterns that were evident in the polls throughout most of the campaign: women, older people, those in more affluent circumstances and those who were born elsewhere in the UK were all relatively reluctant to vote Yes."