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Table 1 Multivariable analysis using the Cox frailty survival model (log-normal frailty distribution)

From: Modeling the determinant of time to age at first marriage among women in Ethiopia using Cox models with mixed effects

Covariate

Coeff

St.err

P-value

ϕ

Residence

    

Urban (ref)

    

Rural

− 0.1188

0.0307

 < 0.001

0.8880

Education level

No Education (ref)

    

Primary

0.2871

0.0524

 < 0.001

1.3325

Secondary

0.8309

0.0495

 < 0.001

2.2953

Higher

1.0422

0.0520

 < 0.001

2.8354

Religion

    

Catholic (ref)

    

Orthodox

− 0.0516

0.1258

0.68

0.9498

Protestant

− 0.0834

0.1255

0.51

0.9200

Muslim

− 0.0148

0.1256

0.91

0.9854

Others

− 0.0929

0.1506

0.54

0.9113

Wealth Index

    

Middle (ref)

    

Poorer

− 0.0338

0.0353

0.34

0.9668

Poorest

− 0.0110

0.0323

0.54

0.9802

Richer

− 0.0363

0.0353

0.30

0.9644

Richest

− 0.0454

0.0337

0.18

0.9556

Head education

No education (ref)

    

Primary

1.5538

0.0326

 < 0.001

4.7293

Secondary

1.5684

0.0387

 < 0.001

4.7990

Higher

1.6063

0.0430

 < 0.001

4.9841

Work status

    

No (ref)

    

Yes

0.1239

0.0208

 < 0.001

1.1319

Access to media

Yes (ref)

    

No

− 0.0273

0.0239

0.25

0.9730

Head occupation

Professional (ref)

    

Agriculturalist

− 0.0485

0.0255

0.057

0.9526

Laborers

− 0.0951

0.0400

0.017

0.9092

Business

− 0.0692

0.0373

0.064

0.9331

Others

− 0.0228

0.0431

0.60

0.9774

Random effect

Group name

Variance

P-value

Region

0.9972

< 0.001