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. 2012 Jul 11;2012(7):CD004425. doi: 10.1002/14651858.CD004425.pub6

Halbe 1998.

Methods Multicenter open trial in Brazil. 
 Pretreatment wash‐out was not described. 
 6 treatment cycles.
Participants 595 healthy women of fertile age with regular ovulatory cycles. Excluded women with contraindications to oral contraceptives, breast feeding or regular use of drugs that impair the efficacy of oral contraceptives.
Interventions Group 1: DSG 150 µg plus EE 30 µg 
 Group 2: Gestodene (GSD) 75 µg plus EE 30 µg
Outcomes Acne severity score ("absent" no acne lesions; "mild" < 6 comedones or papules; "moderate" 6‐15 comedones or papules and < 4 inflamed lesions; "severe" > 15 comedones or papules and > 3 inflamed lesions). 
 Early discontinuation due to side effects.
Notes Methods of randomization and allocation concealment were not described. 
 94 women were excluded, discontinued early or were lost to follow‐up.
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment (selection bias) Unclear risk No information