I need to do a couple of graphs, but I'm seeing two different correlations. I suspected one - it's a strong, but not universal, Jewish custom to have n+1 candles on a birthday cake. This makes sense because there are similar customs. Example - people will choose a psalm to say themselves or for another person using that system - my psalm this year would be Psalm 46.
The other was just interesting - I'm noting a strong correlation for the Northeast, even for people who are NOT Jewish.
These need graphing.