Before I start my most up-to-date timing analysis (for 500 charts), I thought it might be helpful to post the earlier results I found. I wrote short summaries of my findings after looking at 200 charts, 300 charts, and 400 charts. What is interesting if you follow the results each time I added another 100 charts to the survey is that the conclusions stayed pretty much the same. The main difference is that any time a particular timing method appeared to be very effective (70% or higher effectiveness rate), that rate dropped as I added more charts.
So here is the summary from the first 200 charts I looked at:
To try to figure out what really works in gender swaying, I analyzed 101 girl charts and 102 boy charts in FF, paying particular attention to CM and BD patterns from five days before ovulation to the day after ovulation. This is what I found.
1. Does BD on ovulation favor boys?
Yes, but the influence may not be that strong.
Out of the 101 girl charts, 54 (53.5% of charts) had BD on ovulation. Out of the 102 boy charts, 60 had BD on ovulation (58.8% of charts). [Before I almost doubled my sample of charts, 69.6% of the boy charts had BD on ovulation. This is the only number that changed significantly when I added the new charts.]
- Thus BD on ovulation results in a 47.4% chance of a girl (54/114), and a 52.6% chance of a boy (60/114) - which isn't much different than chance.
The amount of CM on ovulation does seem to sway things one way or the other, though.
- 73 charts had ewcm on ovulation: 32 girls (32/74 = 43.2%), and 42 boys (42/74 = 56.8%)
- 41 charts did not have ewcm on ovulation: 22 girls (22/40 = 55%), and 18 boys (18/40 = 45%).
Conclusion: BD on ovulation appears to slightly favor boys (52.6%). The kind of CM present is also significant. If ewcm is present, there is a stronger chance of a boy (56.8%), but if it is not, girls are favored (55%).
2. Does frequent BD through Ovulation favor girls?
No. Frequent BD through ovulation favors boys by a little bit, and the more frequent the BD, the more it favors boys.
The number of BD sessions overall was almost exactly the same in the boy and girl charts. The 101 girl charts had 341 BD sessions, for an average of 3.38 times. The 102 boy charts had 349 BD sessions, for an average of 3.42 times.
The number of charts with frequent BD (4 sessions or more) was also almost exactly the same, with 44 boy charts and 45 girl charts. The more frequent the BD, though, the more it favors boys.
- 43 charts had 5 or more BD sessions: 24 boy charts (24/43 = 55.8%), 19 girl charts (19/43 = 44.2%)
- 18 charts had 6 or more BD sessions: 12 boy charts (12/18 = 66.7%), 6 girl charts (6/18 = 33/3%)
- 5 charts had 7 or more BD sessions: 4 boy charts (4/5 = 80%), 1 girl chart (1/5 = 20%)
The reason why frequent BD through ovulation seems to favor boys may be because of BD on ovulation itself, which seems to favor boys (see #1).
- Of the 45 girl charts, 27 had BD on ovulation (60% of the girl charts)
- Of the 44 boy charts, 34 had BD on ovulation (77.3% of the boy charts).
- So out of these 61 frequent BD charts with BD on ovulation, girls resulted 44.3% of the time (27/61) and boys resulted 55.7% of the time (34/61).
However, looking at the 28 charts with frequent BD that avoided ovulation, the balance tips towards girls. 64.3% of these charts produced girls (18/28), but only 35.7% produced boys (10/28).
BD for at least 4 consecutive days with no gaps in the last 4 days of BD also did not favor girls. For the most part, the results were the same you'd get by chance (49% girl, 51% boy).
- Out of 31 charts with this pattern, 15 produced girls (15/31 = 48.4%), and 16 produced boys (16/31 = 51.6%).
- Out of 17 charts with at least 5 consecutive days, 8 produced girls (8/17 = 47.1%), and 9 produced boys (9/17 = 52.9%.)
- With 6 consecutive days, though, boys were strongly favored. There were 9 charts, 2 that produced girls (2/9 = 22.2%), and 7 that produced boys (7/9 = 77.8%).
- With 7 consecutive days, boys were still favored. In 3 charts, 1 produced a girl (1/3 = 33.3%), and 2 produced boys (2/3 = 66.7%).
When ovulation was avoided in these charts with long strings of consecutive BD, girls were favored. 5 charts out of the 31 avoided ovulation, 4 girls (4/5 = 80%), 1 boy (1/5 = 20%). This sample is so small, though, that the results aren't very reliable.
Conclusion: Frequent BD may reduce sperm count, but it seems that if the frequent BD continues through ovulation, the fact that BD on ovulation favors boys may cancel that benefit out.
- The results are the same as chance if you have 4 or 5 consecutive BD sessions.
- Boys are favored a little bit if there are gaps in the BD sequence (55.7%) or if you have 6 or 7 straight BD days (66.7% to 77.8%).
- Frequent BD favors girls (64.3 to 80%) if you avoid BD on ovulation.
3. Does one time BD favor boys?
No. Both girl and boy charts have pretty similar patterns of one-time BD. If there is any preference, it appears to be for girls.
16 charts had only one BD session - 9 girl charts, and 7 boy charts. This produces a 56.3% (9/16) preference for girls, but since the sample is relatively small, I think it's questionable whether BD one time truly favors girls.
The patterns of BD were also similar.
- 3 boy and 2 girls charts had the BD on ovulation
- 1 boy and 1 girl chart had the BD 1 day before ovulation
- 1 boy and 3 girls charts had the BD 2 or 3 days before ovulation
- 2 boy and 3 girl charts had the BD 4 to 6 days before ovulation
If ewcm was present on the single BD session, it seemed to favor girls. Since that conflicts with some other findings, it might just be a result of the small sample, but it is still notable.
- 3 out of 7 boy charts (42.9%) had ewcm. Those 3 days were all on ovulation itself. All of the cut-offs lacked ewcm.
- 6 out of 9 girl charts (66.7%) had ewcm. 1 day was on ovulation; 5 were on cut-offs.
- If the 1 BD session with ewcm was on ovulation, it produced a 75% preference for boys (3/4), and a 25% preference for girls (1/4).
- If the 1 BD session was not on ovulation and had ewcm, it produced a 100% preference for girls (5/5).
- If the 1 BD session was not on ovulation and lacked ewcm, it produced a 66.7% preference for boys (4/6), and a 33.3% preference for girls (2/6).
Conclusion: The sample is too small to reach any strong conclusions, other than that there doesn't appear to be evidence that BD 1 time favors boys. What is notable, though, is that BD 1 time is not the most effective way to get pregnant. Only 7.9% of all the charts I looked at (16/203) had this pattern.
4. Does BD without ewcm favor girls?
Yes.
38 out of 101 girl charts (37.6%) had either no ewcm when BD or had only 1 BD session on a day with ewcm. 28 out of 101 boy charts (27.5%) followed that same pattern.
- 17 girl charts (17/30 = 56.7%) and 13 boy charts (13/30 = 43.3%) had 0 BD sessions with ewcm
- 12 girl charts (12/16 = 75%) and 4 boy charts (4/16 = 25%) had a cut-off of 2 or more days of ewcm
- 9 girl charts (9/20 = 45%) and 11 boy charts (11/20 = 55%) had one day of ewcm on the day before, the day after or the day of ovulation.
Curiously, if there is at least a 2 day cut-off of BD, the presence of ewcm appears to favor girls while the lack of it appears to favor boys. (See #5)
Conclusion: If there are no days of BD on a day with ewcm or if there is a cut-off of at least two days of ewcm, girls are favored (56.7% and 75% respectively).
5. Do cut-offs of at least 2 days favor girls?
No. Cut-offs seem to produce similar numbers of girls and boys. [Note: Actually, looking at the data, cut-offs only produce similar numbers of boys and girls if charts that have a cut-off AND BD that day after ovulation are included. Cut-offs by themselves do produce more girls.]
There were equal numbers of boy and girl charts with cut-offs, counting charts that had at least a 2 day cut-off OR a 2 day cut-off and then BD on the day after ovulation.
- 19 Girl Charts: 2 day cut off: 8 (1 w/BD on Day +1), 3 day cut-off: 7 (1 w/BD on Day +1), 4 day cut-off: 2, 5 day cut-off: 2 (1 w/BD on Day +1), 6 day cut-off: 0
- 19 Boy Charts: 2 day cut off: 10 (2 w/BD on Day +1), 3 day cut-off: 5 (3 w/BD on Day +1), 4 day cut-off: 3 (1 w/BD on Day +1), 5 day cut-off: 0, 6 day cut-off: 1
Cut-offs of at least 2 days slightly favored girls (16/29 = 55.2%), and cut-offs of 2 to 3 days also slightly favored girls (13/23 = 56.5%). Cut-offs of 4 days or more had equal results (3/6 = 50%). However, when charts that included a cut-off and BD the day after ovulation were included, the preference for girls disappears and odds of a girl are exactly 50/50 no matter how long the previous cut-off was.
Girl and boy charts had similar amounts of ewcm on BD days, with girls showing slightly more ewcm (girls 24/40 = 60% of the time, boys 24/42 = 57.1% of the time). However, in contrast to other findings, CM with cut-offs seemed to favor girls.
- There were more boy charts that had 0 days of BD w/ewcm (7/11 = 63.6%) than girl charts (4/11 = 36.4%).
- There was also a significant preference for girls if the last day of the cut-off had ewcm. 15/26 girl charts = 57.7%; 11/26 boy charts = 42.3%. (This is not counting whether ewcm was present the day after ovulation.)
Conclusion: There seems to be a preference for girls (55.2% to 56.5%) with a cut-off as long as there is no BD on the day after ovulation. The preference is larger if the cut-off is only 2 to 3 days (56.5%). It appears that cut-offs with ewcm also favors girls. More boys had charts with no ewcm (63.6%), and a greater number of girl charts had ewcm on the last day of the cut-off (57.7%).
Patterns That Favor Girls
- BD on ovulation without ewcm. (55%)
- Frequent BD (4+ times) that avoids ovulation. (64.3%)
- Cut-offs of 2 or 3 days. (56.5%)
- Cut-offs where there is ewcm on the last day of the cut-off. (57.7%)
- Never BD on a day when ewcm is present. (56.7%)
- Having a cut-off of BD on days with ewcm (not a cut of BD period) of at least 2 days. (75%)
- Frequent BD with 4 or 5 consecutive days of BD that stops before ovulation. (80%) (Small sample so not very reliable.)
- BD 1 time. (56.3%) (Small sample so not very reliable.)
- BD 1 time with ewcm as long as it is not on ovulation. (100%) (Small sample so not very reliable.)
Patterns That Favor Boys
- BD on ovulation. (52.6%)
- BD on ovulation with ewcm. (56.8%)
- Frequent BD (4+ times) through ovulation if there are gaps in sequence. (55.7%)
- Frequent BD (4+ times) through ovulation with 6 or 7 consecutive days of BD. (66.7 to 77.8%) (Small sample so not very reliable.)
- Cut-offs where there is no ewcm on the BD days. (63.6%) (Small sample so not very reliable.)
Patterns That Are 50/50
- Frequent BD (4+ times) through ovulation with 4 or 5 consecutive days of BD and no gaps in the last 4 BD days.
- Cut-offs of 4 or more days if the cut-off is followed by BD on the day after ovulation. (Small sample so not very reliable.)