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Table 2 Included studies and quality assessment

From: Effectiveness and acceptability of progestogens in combined oral contraceptives – a systematic review

Study Sponsorship Intervention Methods
    Randomization Allocation concealment Blinding Intention to treat analysis
Affinito [18] Pharmaceutical company GSD vs NGM unclear unclear not unclear
Droegemüller [8] No information LNG vs NE unclear unclear not yes
Dunson [12] Family Health International NG vs NE unclear adequate not not
Endrikat [19] Pharmaceutical company GSD vs DSG unclear unclear not yes
Endrikat [20] Pharmaceutical company LNG vs NE unclear unclear not yes
Foidart [26] Pharmaceutical company DSG vs DRSP unclear unclear not unclear
GSD group [13] Pharmaceutical company GSD vs DSG unclear unclear not yes
Halbe [29] Pharmaceutical company GSD vs DSG unclear unclear not yes
Huber [10] Pharmaceutical company DSG vs DRSP unclear unclear not yes
Koetsawang [28] Pharmaceutical company GSD vs DSG unclear unclear not unclear
L. America [27] Pharmaceutical company GSD vs DSG block randomisation unclear not yes
Loudon [17] No information GSD vs LNG unclear unclear double blind unclear
Percival [23] Pharmaceutical company NG vs NE random list unclear investigator blind unclear
Rabe [14] Pharmaceutical company GSD vs LNG unclear unclear not yes
Ramos [22] Pharmaceutical company and UNFPA LNG vs NE unclear unclear double blind yes
Reiter [21] Planned Parenthood Centers NG vs NE unclear unclear not unclear
Rossmanith [9] Pharmaceutical company DSG vs NE unclear unclear double blind yes
Serfaty [16] Pharmaceutical company GSD vs DSG block randomisation unclear not unclear
Shoupe [15] Pharmaceutical company DSG vs NE computer generated random number tables adequate double blind unclear
Singh [24] Pharmaceutical company DSG vs NE unclear unclear not yes
Weber-Diehl [25] Pharmaceutical company GSD vs NE unclear unclear not unclear
Zichella [11] Pharmaceutical company GSD vs DSG unclear unclear unclear yes