With the additional 200 charts, frequent consecutive BD is now showing a small preference for girls - but it still appears to be a much less effective girl timing method than others we have looked at.
Frequent, consecutive BD is defined as charts where the BD ended with at least 4 consecutive BD times. So, for instance, if a chart had 5 BD times, starting with 1 day of BD, followed by a gap of one day, followed by 4 days with BD every day, it was included. But if it started with 2 days of BD, followed by a gap of one day, followed by 3 days with BD, it was not included. Also, I counted multiple BD times during one day as separate BD times. So I included charts that had, for instance, 1 day with 1 BD time, followed by a day with 2 BD times, followed by a day with 1 BD time.
There was a small preference for girls on the charts with frequent, consecutive BD. There were 57 boy charts and 66 girl charts with this pattern, resulting in a preference of 53.7% for girls.
- 4+ consecutive BD times: 57 boy charts, 66 girl charts (sways for girl 53.7%)
- 5+ consecutive BD times: 34 boy charts, 37 girl charts (sways for girl 52.1%)
- 6+ consecutive BD times: 21 boy charts, 19 girl charts (sways for boy 52.5%)
- 7+ consecutive BD times: 10 boy charts, 12 girl charts (sways for girl 54.5%)
And here are the actual numbers of charts that had 4, 5, 6, etc. BD times on them:
- 4 consecutive BD times: 23 boy charts, 29 girl charts (sways girl 55.8%)
- 5 consecutive BD times: 13 boy charts, 18 girl charts (sways girl 58.1%)
- 6 consecutive BD times: 11 boy charts, 7 girl charts (sways boy 61.1%)
- 7 consecutive BD times: 7 boy charts, 9 girl charts (sways girl 56.25%)
- 8 consecutive BD times: 2 boy chart, 3 girl charts (sways girl 60%)
- 9 consecutive BD times: 1 boy chart, 0 girl charts (sways boy 100%)
While frequent, consecutive BD favors girls, the degree to which it does so decreases if we look at just the charts that had BD on ovulation. Of these frequent, consecutive BD charts, 53 boy charts and 57 girl charts had BD on the day of ovulation, resulting in a 51.8% preference for girls. This IS a percentage that is greater than chance, but it's not a whole lot greater.
Frequent consecutive BD that avoids ovulation still favors girls, but to a much smaller degree than it did previously. 4 boy charts and 9 girl charts in the study had this pattern, which results in a 69.2% preference for girls.