So far, I've looked at how 1 BD time, 3 BD times, and 4+ BD times sway, so I figured it was time to look at how 2 BD times sway as well. :)
There were 72 boy charts and 65 girl charts, resulting in a preference for boys of 52.6%. This is the breakdown of the charts.
- 2 non-consecutive times including ovulation: 13 boy charts, 11 girl charts (sways boy 54.2%)
- 2 consecutive times including ovulation and NOT the day after O: 6 boy charts, 14 girl charts (sways girl 70%)
- 2 consecutive times, O and the day after O: 8 boy charts, 2 girl charts (sways boy 80%)
- 2 non-consecutive times including the day after O: 10 boy charts, 7 girl charts (sways boy 58.8%)
- 2 non-consecutive times with a 1 day cut-off: 16 boy charts, 11 girl charts (sways boy 59.3%)
- 2 consecutive times with a 1 day cut-off: 5 boy charts, 3 girl charts (sways boy 62.5%)
- 2 times with a 2 day cut-off: 14 boy charts, 17 girl charts (sways girl 54.8%)
As you can see, most of the patterns with 2 BD times sway boy, and most of those appear to sway boy substantially. There are only two exceptions. One is the pattern with a 2 day cut-off. Not surprisingly, this shows a small preference for girls, as fits with the previous finding that cut-offs in general favor girls.
More surprisingly, 2 consecutive BD times that include ovulation but NOT the day after showed a surprisingly signficant preference for girls. There were two specific patterns in this category:
- the day before and day of ovulation: 5 boy charts, 12 girl charts (sways girl 70.6%)
- twice on the day of ovulation: 1 boy chart, 2 girl charts (sways girl 66.7%)
Since the day before and day of ovulation are typically viewed as prime boy swaying days, I don't know why BD on BOTH those days appears to favor girls. There also aren't that many charts with this pattern (only 20), so I can't really bring myself to suggest this as a good girl swaying pattern. But if you accidentally end up with this pattern, it doesn't look like it's the worst BD pattern for a girl. And if you are swaying for a boy, it appears that it is good to BD on the day before ovulation OR the day of - but not both.