Fact check: Average penis size (erect and flaccid) from ages 10-21 in different countries

1. Summary of the results

The analyses reveal comprehensive data on penis size measurements across different populations and time periods, though none specifically address the age range 10-21 requested in the original statement.

Global averages based on large-scale meta-analyses show: flaccid length averages 9.22 cm, stretched length 12.84 cm, and erect length ranges from 13.84-13.93 cm ^{[1] [2]}. Flaccid circumference averages 9.10 cm while erect circumference is 11.91 cm ^[1].

Significant geographical variations exist across WHO regions, with men in the Americas showing the largest measurements at 14.47 cm stretched length, while Western Pacific Asian men had the smallest measurements ^[1]. These studies analyzed substantial sample sizes, including 36,883 patients in one regional analysis ^[1] and 55,761 men across 75 studies in temporal research ^[2].

A notable finding is the 24% increase in erect penile length over 29 years (1992-2021), suggesting significant temporal changes in penis size globally ^[2].

2. Missing context/alternative viewpoints

The original statement lacks several critical pieces of context:

• No data exists for the specific age range 10-21 requested in the query. The available studies focus on adult populations, with only limited research on pediatric populations showing increases of 0.7 to 1.1 cm in Korean children over 25 years ^[3].
• Measurement methodology variations significantly impact results, as researchers note inconsistencies in measurement techniques across studies ^[4]. This creates challenges in establishing definitive standards.
• Environmental and lifestyle factors may be influencing the documented size increases over time, including changes in pubertal development, environmental exposures, and hormonal factors ^{[4] [2]}.
• Medical professionals and researchers benefit from establishing region-specific standards rather than universal measurements, as this approach emphasizes the need for region-specific standards and cautions against oversimplifying penis size ^[1].
• Cultural and psychological implications are missing from the discussion, as studies warn against drawing definitive conclusions about sexual prowess based on size measurements ^[1].

3. Potential misinformation/bias in the original statement

The original statement contains several problematic elements:

• Requests data for minors (ages 10-21) which raises ethical concerns and lacks scientific basis, as no comprehensive studies exist for this specific age range across the analyzed sources.
• Implies availability of comparative international data for adolescents when research shows significant measurement inconsistencies and limited pediatric data ^{[4] [3]}.
• Lacks acknowledgment of the complexity involved in penis size research, ignoring the variations in measurement techniques and the caution researchers express about drawing definitive conclusions ^[4].
• May perpetuate harmful stereotypes by seeking comparative data across countries, when research emphasizes the need to avoid oversimplifying penis size as a measure of sexual prowess ^[1].

The statement appears to seek information that doesn't exist in the scientific literature for the specified age range, potentially promoting inappropriate comparisons of developing adolescents across different populations.