50% are thin
Pcos splits 50/50 into 'thin' and excess weight ; patients are similar but not identical.
The confusion is understanding differences in diagnostic criteria vs. Other features of pcos. Most experts diagnose pcos as 2 out of 3: irregular or missed periods, clinical or blood evidence of extra androgens, and polycystic look of ovaries on ultrasound. Weight, hair-growth, are associated but variable.