Table 7 Results of multinomial (for both genders and men) and binary (for women) logistic regression models (relative risks and odd ratios) of partners’ age differences at first sex on key determinants and control variables for 2000 and 2017 SELFY waves

 Women

12.39***

10.60***

-

-

-

-

(1.599)

(0.984)

-

-

-

-

 Friend

0.209***

0.229***

0.237***

0.180***

0.184

0.983

(0.0887)

(0.0836)

(0.111)

(0.0741)

(0.196)

(0.568)

 Boy/girl friend

0.107***

0.130***

0.110***

0.0696***

0.107**

0.726

(0.0438)

(0.0461)

(0.0494)

(0.0277)

(0.111)

(0.406)

 Mean sexual debut

0.551***

0.627***

0.478***

0.750

0.520***

0.569***

(0.0701)

(0.0563)

(0.111)

(0.138)

(0.0819)

(0.0597)

 Late sexual debut

0.399***

0.562***

0.737

0.936

0.300***

0.461***

(0.0564)

(0.0567)

(0.193)

(0.189)

(0.0499)

(0.0531)

 No (single earner)

0.953

1.262***

0.607**

1.167

1.079

1.274***

(0.0981)

(0.100)

(0.130)

(0.192)

(0.128)

(0.115)

 Balanced relationship (father)

0.903

1.075

0.598**

1.044

1.021

1.094

(0.102)

(0.104)

(0.142)

(0.210)

(0.129)

(0.119)

 Balanced relationship (mother)

1.216

0.884

1.314

0.489**

1.198

1.007

(0.167)

(0.127)

(0.391)

(0.146)

(0.180)

(0.157)

 Working regularly

1.216

0.994

1.888**

0.736

0.945

1.086

(0.185)

(0.102)

(0.501)

(0.159)

(0.163)

(0.128)

 Older brother

1.474***

1.202**

1.186

1.204

1.566***

1.245**

(0.171)

(0.0983)

(0.269)

(0.199)

(0.213)

(0.117)

 Smoking frequently

0.932

1.272**

1.040

1.484**

0.920

1.217

(0.125)

(0.131)

(0.247)

(0.274)

(0.147)

(0.149)

 Getting drunk frequently

0.766

0.847

1.411

0.720

0.374

0.908

(0.169)

(0.113)

(0.400)

(0.162)

(0.109)

(0.154)

 Constant

3.134***

1.572

3.429**

4.067***

-

-

(1.336)

(0.598)

(1.806)

(2.042)

-

-

 Women

0.133***

0.115***

-

-

-

-

(0.0244)

(0.0159)

-

-

-

-

 Friend

0.915

0.546

0.879

0.488

-

-

(0.582)

(0.232)

(0.571)

(0.227)

-

-

 Boy/girl friend

1.651

0.832

1.513

0.694

-

-

(1.011)

(0.338)

(0.945)

(0.310)

-

-

 Mean sexual debut

1.445**

1.658***

1.406*

1.574***

-

-

(0.271)

(0.202)

(0.283)

(0.203)

-

-

 Late sexual debut

2.354***

2.307***

2.571***

2.179***

-

-

(0.462)

(0.297)

(0.558)

(0.301)

-

-

 No (single earner)

1.106

1.163

0.902

1.166

-

-

(0.155)

(0.114)

(0.142)

(0.124)

-

-

 Balanced relationship (father)

1.050

1.051

1.072

1.017

-

-

(0.174)

(0.130)

(0.210)

(0.137)

-

-

 Balanced relationship (mother)

0.868

0.992

0.782

0.781

-

-

(0.171)

(0.209)

(0.183)

(0.187)

-

-

 Working regularly

1.224

1.061

1.254

1.044

-

-

(0.246)

(0.131)

(0.292)

(0.138)

-

-

 Older brother

0.889

0.937

0.820

1.019

-

-

(0.143)

(0.0959)

(0.148)

(0.113)

-

-

 Smoking frequently

0.841

1.009

0.826

1.008

-

-

(0.152)

(0.129)

(0.165)

(0.137)

-

-

 Getting drunk frequently

0.971

0.790

0.983

0.715**

-

-

(0.230)

(0.118)

(0.254)

(0.112)

-

-

 Constant

0.319*

0.471

0.404

0.747

37.77***

2.684*

(0.206)

(0.217)

(0.269)

(0.382)

(39.65)

(1.571)

Observations

2530

4,397

901

1,992

1629

2,405

Pseudo R-squared

0.225

0.207

0.0719

0.0422

0.0472

0.0231

Log Lik

−1902

−3593

−843.9

−1793

−900.2

−1555