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Table 1. Exclusion Criteria, Reasons for Exclusion, and Number of Excluded Participants
Exclusion criteria Reasons for exclusion n 
Not finishing the initial survey Missing data 249 
Not biologically female Potential hormonal influences; no need to use contraceptives to prevent pregnancy 
Not predominantly heterosexual No need to use contraceptives to prevent pregnancy 26 
Currently in a homosexual romantic relationship No need to use contraceptives to prevent pregnancy 
Older than 50 Potential hormonal influences 35 
(Post-)menopausal Potential hormonal influences 41 
Pregnant Potential hormonal influences 23 
Breastfeeding Potential hormonal influences 28 
Trying to become pregnant No need to use contraceptives to prevent pregnancy 61 
“Taking a chance” of becoming pregnant Need to use contraceptives to prevent a pregnancy is low 41 
Using no contraceptive methods for other reasons No information about contraceptive method 55 
Choice of contraceptive methoda        Morning-after pill        Breastfeeding        I am infertile        My partner is infertile        I am sterilized        My partner is sterilized        Other contraceptive method Potential hormonal influences and/or no need for hormonal contraception  34 12 1 2 2 2 7 9  
Incongruent information about contraceptive methodb Potential hormonal influences 39 
Medication including sex hormones Potential hormonal influences 
Total  481 
Exclusion criteria Reasons for exclusion n 
Not finishing the initial survey Missing data 249 
Not biologically female Potential hormonal influences; no need to use contraceptives to prevent pregnancy 
Not predominantly heterosexual No need to use contraceptives to prevent pregnancy 26 
Currently in a homosexual romantic relationship No need to use contraceptives to prevent pregnancy 
Older than 50 Potential hormonal influences 35 
(Post-)menopausal Potential hormonal influences 41 
Pregnant Potential hormonal influences 23 
Breastfeeding Potential hormonal influences 28 
Trying to become pregnant No need to use contraceptives to prevent pregnancy 61 
“Taking a chance” of becoming pregnant Need to use contraceptives to prevent a pregnancy is low 41 
Using no contraceptive methods for other reasons No information about contraceptive method 55 
Choice of contraceptive methoda        Morning-after pill        Breastfeeding        I am infertile        My partner is infertile        I am sterilized        My partner is sterilized        Other contraceptive method Potential hormonal influences and/or no need for hormonal contraception  34 12 1 2 2 2 7 9  
Incongruent information about contraceptive methodb Potential hormonal influences 39 
Medication including sex hormones Potential hormonal influences 
Total  481 

Note.a Numbers of contraceptive methods add up to 35 (rather than 34) because women could report several hormonal contraceptives that led to exclusion. b Participants, who reported recently changing their contraceptive method (in the last three months), were excluded because this might influence their hormonal status when participating in our study.

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