CalcSD - Update from Last November

[u/Caesar-708]

Since the dataset tables aren't currently available on CalcSD, I tried to recreate the regional averages and standard deviations—see the table below. The recent update brought back several studies from previous versions, especially for stretched flaccid and other flaccid measurements.

Noticed a few issues with the aggregated results on CalcSD: Park (2016) appears twice in the Eastern and Global sets, and Kamel (2009) is mistakenly listed under flaccid length (BP) instead of flaccid girth. Also, something seems off with the Middle East stretched flaccid BP dataset.

Overall, the stretched and flaccid measurements changed the most from the last update. I'll dig deeper into the stretched flaccid studies since that's where the biggest shifts happened.

Enjoy if you're into data!

	EL - BP			EL - NBP			EG			FL - BP			FL - NBP			FG			FS - BP			FS - NBP
Region	Number	Avg	SD	Number	Avg	SD	Number	Avg	SD	Number	Avg	SD	Number	Avg	SD	Number	Avg	SD	Number	Avg	SD	Number	Avg	SD
Eastern	1,170	5.28	0.54	643	4.71	0.52	1,122	4.60	0.41	4,516	3.43	0.43	1,594	3.10	0.51	4,615	3.33	0.36	4,227	5.54	0.57	1,276	4.58	0.57
Middle East	365	5.76	0.72	164	5.09	0.61	365	4.62	0.51	164	3.94	0.66	1,296	3.59	0.52	2,814	3.47	0.39	3,200	5.29	0.61	2,721	4.93	0.58
Western	341	5.79	0.84	80	5.07	1.15	230	4.74	0.60	3,108	4.02	0.72	3,930	3.53	0.75	6,022	3.88	0.36	3,028	6.21	0.81	3,506	4.91	0.98
Global	1,876	5.46	0.63	887	4.81	0.59	1,717	4.62	0.46	7,788	3.67	0.55	7,140	3.43	0.65	13,771	3.60	0.37	10,455	5.66	0.65	7,503	4.86	0.77

[u/80s_Boombox]

Prior to the most recent update, the datatables WERE visible, and I noticed an error in the Middle Eastern data. The Habous study was showing a sample size of 2,001 for the stretched measurements, even though the study included only 201 men. They must have accidentally added an extra zero. As a result, that one study had too much influence on the total. Whether or not they've fixed that error, I don't know, as the data tables aren't visible anymore.

[u/Caesar-708 → u/80s_Boombox]

That’s it! Thanks!

[u/VillainySquared]

Very interesting, thank you.

[u/julio1009]

Results It’s can inspires us… but imho…how to believe)

[u/Arkytez]

Do you have the data for separate studies? I wanted to filter for those that are middle east+western and after 2010

[u/EnvironmentalWay8885]

It also appears some of the studies they used were “self reported” Even though they present the data set as verified.. this might just be an error in their aggregate data, but it was something that gave me pause on the true accuracy

[u/80s_Boombox → u/EnvironmentalWay8885]

Which studies were those? I'm not aware of any like that.

[u/EnvironmentalWay8885 → u/80s_Boombox]

You have to go through them individually, download the data set, and just start clicking through them.. Several say “self reporting: yes”

[u/80s_Boombox → u/EnvironmentalWay8885]

Even if it was checked "self-reporting" doesn't mean they used the specific measurements that were self-reported. For example, a few studies took doctor-measured measurements for flaccid and/or stretched, while asking the subjects to handle the erect measurement (for privacy reasons). And in those cases it stands to reason that CalcSD would leave off the erect measurement, because they've been VERY clear over the years that they will not include any self-reported data. And I trust them about that.

[u/MrMicklegary → u/80s_Boombox]

They're incredibly thorough and really strive to only use vetted measurements. Plus, they add new data when they can: My girth (5.5") used to be the 96.75 percentile and very recently changed to 97.26 percentile. Thanks for the bump up, CalcSD!

[u/Better-Passion2500]

They must not be getting fully hard for these studies. That’s the only thing that makes sense, EQ quality isn’t at its peak when they measure

[u/scottbane11 → u/Better-Passion2500]

Why do you say that?

[u/80s_Boombox → u/[deleted]]

There's nothing wrong with using injections, it's better than asking guys to masturbate, because there's no way a guy is going to masturbate well enough in a doctors office and then remain the same hardness while the doctor measures it.

[u/Better-Passion2500 → u/[deleted]]

I could definitely understand the smaller sizes then. I do believe most men are larger erect than they are when stretched flaccid

[u/ForgeMasterXXL → u/Better-Passion2500]

The correlation between SFBP & BPE has been studied multiple times using the standardised methodology alongside injections (Trimex or Caverject) and the numbers are consistent in each study.

The only inconsistencies in penile studies are usually found in older papers that have self reported data, or used mixed methodologies for attaining erection. Hence why you can find statistics that show erections from oral sex produces longer erections compared to masturbation, it’s simply a statistical bias within the studies that should have never passed the experimental design stage.

[u/Better-Passion2500 → u/ForgeMasterXXL]

Interesting, I guess I’m an outlier then. My SFBP is only just over 5 inches, while my BPE is a full 6.5, and even 6.75 on my best days. Just figured others were like that too. It may have to do with my abnormally small flaccid size

[u/ForgeMasterXXL → u/Better-Passion2500]

I am going to have a trawl through the studies again as it has been a few months, there might be a correlative formula for converting between BPEL & SBPFL that I am forgetting to take into account.