Since I've gotten some questions about the "frequent BD that avoids ovulation" timing method, I thought I would look a little closer into which charts that followed this pattern seemed to work best for girls.
Again, this pattern is defined as at least 4 BD times between 5 days prior to ovulation through the day afterward but NO BD on the day of ovulation itself. There were 58 charts with this pattern: 33 girl charts, and 25 boy charts, which results in a 56.9% preference for girls. (If you've been following this blog, you may have noticed that this is a different total than I gave previously. Yup, even though I double and triple check this information before sharing it with people, I'm still capable of goofing up and losing 11 charts. *sigh* At least the error is fixed now.)
- 1 day cut-off: 3 boy charts, and 13 girl charts (sways girl 81.25%)
- 2 day cut-off: 1 boy chart, and 2 girl charts (sways girl 66.7%)
- 1 day cut-off and day after ovulation: 17 boy charts, and 16 girl charts (sways boy 51.5%)
- 2 day cut-off and day after ovulation: 4 boy charts, and 2 girl charts (sways boy 66.7%)
What is obvious from looking at how the charts break down is that the charts that did not have BD the day after ovulation clearly favored girls (4 boy charts and 15 girl charts, favors girls 78.9%), and the charts that had BD the day after ovulation favored boys (21 boy charts and 18 girl charts, favors boys 55.3%).
Please note that I do NOT think this means that a cut-off and O+12 favors boys. As I've said before, the FF charts do not tell when ovulation actually occurred, so it's impossible to tell whether any BD times on them are O+12. I suspect that the reason there were more boy charts that had BD the day after ovulation is because in some cases ovulation occurred late on the day of ovulation and the BD happened early the next day and so the BD the "day after ovulation" was really in boy timing.
If BD "the day after ovulation" is avoided, frequent BD that avoids ovulation favors girls very strongly. Unfortunately, there are fewer than 20 charts with this pattern so the effectiveness rate is probably quite a lot lower than the 78.9% it is showing right now. However, despite the uncertainty about exactly how effective this timing method really is, I still feel comfortable enough with it that it is the one I plan to use in my sway.