"We have thought this to be a bot of a canard, for it doesn't take into account second marriages and similar circumstances which may arise in life."
No. It takes into account the marriage liscenses and divorce filings and ratios them. So in fact, it DOES take into account second marriages and such.
Not to mention that many divorcees end up remarrying and divorcing AGAIN, making the ratio even worse.
So yes, that 1/2 figure is quite accurate.