TABLE 1.

Subgroup analysis of the prevalence of acne scars in patients with acne.

Group	Studies	Prevalence	95% CI	Heterogeneity, I 2
Subtypes †
Atrophic	8	0.78	69%–87%	0.965
Hypertrophic	8	0.17	11%–23%	0.938
Keloids	7	0.03	1%–5%	0.766
Ice‐pick	6	0.52	33%–71%	0.978
Rolling	6	0.24	12%–36%	0.958
Boxcar	4	0.25	8%–41%	0.960
Location †
Cheek	3	0.68	52%–83%	0.972
Mandibular area	3	0.29	0%–59%	0.994
Forehead	3	0.35	22%–48%	0.995
Temple	2	0.29	14%–45%	0.951
Sex
Female	17	0.46	34%–58%	0.995
Male	14	0.58	44%–72%	0.994
Age
≥25 years	6	0.59	42%–75%	0.983
<25 years	7	0.32	18%–47%	0.995
Region
Africa	6	0.31	11%–51%	0.989
Asia	19	0.52	39%–65%	0.995
Europe	7	0.51	29%–73%	0.996
North America	3	0.50	12%–89%	0.999
South America	2	0.20	10%–30%	0.935
Family history of acne
Yes	2	0.49	47%–51%	0.000
No	2	0.40	0.35–0.45	0.195
Acne severity
Mild acne	6	0.46	30%–62%	0.980
Moderate acne	6	0.67	34%–100%	0.998
Severe acne	6	0.82	64%–100%	0.989
Source of patients
Community	9	0.27	18%–36%	0.992
Clinic	28	0.53	42%–65%	0.996
Assessment
Physician‐diagnosed	32	0.48	38%–57%	0.997
Self‐report	6	0.47	21%–72%	0.997
Sample size
n ≥ 500	14	0.40	27%–52%	0.998
n < 500	23	0.51	36%–67%	0.997

Abbreviation: CI, confidence interval.

^† Prevalence of subtype and location is the proportion conducted in patients with acne scar rather than patients with acne.