Characteristics of prospective studies included in the systematic review.

aall adjusted OR/RRs are as reported by authors,bOR/RRs calculated by authors, raw data not available,cbaseline prevalence used,draw data on the % using OC not available, on the basis of the odds ratios reported, the proportion of women using contraceptives were calculated to well exceed 10%,eper number of visits,fnumber or percentage of assessments rather than number of participants reported, gwoman-years, calculated by authors,hraw data was not available, but parent study from which this cohort was derived reported 29% using HC [89],ibaseline prevalence of women using combined methods of contraception was 53.5% of which most went into the longitudinal analysis, but raw data was not reported,junadjusted ORs clustered by clinic so included as reported. Key: HC = hormonal contraception, COC = combined oestrogen- and progesterone-containing methods of HC, POC = progesterone only containing methods of HC, u-HC = unspecified HC, CS = cross-sectional study, LC = longitudinal cohort, RCT = randomised controlled trial (either LC used or CS data used), OR = odds ratio, RR = risk ratio, NC = no contraception used, TL = tubal ligation.a. 所有校正后的比值比（odds ratio, OR）/相对危险度（risk ratio, RR）均按作者原文报告。 b. 由作者计算所得的比值比/相对危险度，原始数据未公开。 c. 采用了基线患病率数据。 d. 口服避孕药（oral contraceptive, OC）使用占比的原始数据不可得，基于已报告的比值比推算，使用避孕药的女性占比远高于10%。 e. 就诊次数。 f. 报告内容为评估次数或评估占比，而非参与者人数。 g. 女性人年数（woman-years），由作者计算得出。 h. 原始数据未公开，但该队列所衍生的母研究报告称29%的受试者使用激素避孕药（hormonal contraception, HC）[89]。 i. 使用联合避孕方法的女性基线患病率为53.5%，其中多数纳入纵向分析，但原始数据未予呈报。 j. 未校正的比值比按诊所进行聚类，因此按原文所述纳入分析。 术语对照表： HC = 激素避孕药（hormonal contraception） COC = 雌孕激素联合避孕药（combined oestrogen- and progesterone-containing methods of hormonal contraception） POC = 单纯孕激素避孕药（progesterone-only hormonal contraception） u-HC = 未明确分类的激素避孕药（unspecified hormonal contraception） CS = 横断面研究（cross-sectional study） LC = 纵向队列研究（longitudinal cohort study） RCT = 随机对照试验（randomised controlled trial，可采用纵向队列或横断面研究数据） OR = 比值比（odds ratio） RR = 相对危险度（risk ratio） NC = 未使用避孕药（no contraception used） TL = 输卵管结扎术（tubal ligation）