Table 2 Mixed effects models for comparison of behavioral study outcomes

From: Ehealth interactive intervention in promoting safer sex among men who have sex with men

 

Intervention group

Control group

Between-group difference at each time point

Group × Time Effect p-valuea

 

Occurrence

Within-group change from T0, OR (95% CI)

p-value

Within-group change from T1, OR (95% CI)

p-value

Occurrence

Within-group change from T0, OR (95% CI)

p-value

Within-group change from T1, OR (95% CI)

p-value

OR (95% CI)

p-value

 

Had condomless anal sex in the last 3 months

Baseline (T0)

43.75%

    

41.67%

    

1.09 (0.76 to 1.56)

0.645

0.010

3-month follow-up (T1)

31.40%

0.59 (0.41 to 0.85)

0.002

  

43.69%

1.09 (0.80 to 1.48)

1.000

  

0.59 (0.40 to 0.88)

0.009

 

6-month follow-up (T2)

29.89%

0.55 (0.36 to 0.83)

0.002

0.93 (0.67 to 1.29)

0.669

39.90%

0.93 (0.68 to 1.28)

1.000

0.86 (0.63 to 1.16)

0.669

0.64 (0.42 to 0.98)

0.040

 

Had chemsex in the last 3 months

Baseline

8.33%

    

12.50%

    

0.64 (0.35 to 1.16)

0.138

0.643

3-month follow-up

4.35%

0.50 (0.22 to 1.13)

0.122

  

9.46%

0.73 (0.42 to 1.27)

0.517

  

0.44 (0.19 to 0.97)

0.043

 

6-month follow-up

5.43%

0.63 (0.33 to 1.23)

0.241

1.26 (0.66 to 2.42)

0.479

10.34%

0.81 (0.47 to 1.40)

0.766

1.10 (0.78 to 1.56)

0.766

0.50 (0.23 to 1.09)

0.081

 

Had group sex in the last 3 months

Baseline

14.17%

    

20.00%

    

0.66 (0.41 to 1.07)

0.091

0.758

3-month follow-up

16.43%

1.19 (0.73 to 1.93)

1.000

  

20.72%

1.05 (0.69 to 1.59)

1.000

  

0.75 (0.46 to 1.23)

0.255

 

6-month follow-up

14.13%

1.00 (0.63 to 1.58)

1.000

0.84 (0.53 to 1.33)

1.000

20.69%

1.04 (0.70 to 1.55)

1.000

1.00 (0.73 to 1.37)

1.000

0.63 (0.37 to 1.08)

0.092

 

Underwent HIV testing in the last 3 months

Baseline

30.83%

    

40.00%

    

0.67 (0.46 to 0.97)

0.036

0.058

3-month follow-up

36.23%

1.27 (0.83 to 1.95)

0.523

  

33.78%

0.77 (0.53 to 1.11)

0.205

  

1.11 (0.75 to 1.66)

0.595

 

6-month follow-up

35.33%

1.23 (0.80 to 1.88)

0.573

0.96 (0.73 to 1.27)

0.783

31.53%

0.69 (0.46 to 1.04)

0.087

0.90 (0.68 to 1.20)

0.478

1.19 (0.78 to 1.81)

0.429

 

Underwent other STI testing in the last 3 months

Baseline

17.08%

    

21.25%

    

0.76 (0.48 to 1.21)

0.247

0.206

3-month follow-up

21.74%

1.35 (0.85 to 2.13)

0.305

  

18.02%

0.81 (0.52 to 1.28)

0.621

  

1.26 (0.79 to 2.03)

0.335

 

6-month follow-up

22.28%

1.39 (0.86 to 2.26)

0.305

1.03 (0.73 to 1.47)

0.859

22.17%

1.06 (0.73 to 1.53)

0.776

1.30 (0.83 to 2.03)

0.499

1.01 (0.62 to 1.63)

0.978

 
 

Intervention group

Control group

Between-group difference at each time point

Group × Time Effect p-valueb

 

Mean (95% CI)

Within-group change from T0, Mean (95% CI)

p-value

Within-group change from T1, Mean (95% CI)

p-value

Mean (95% CI)

Within-group change from T0, Mean (95% CI)

p-value

Within-group change from T1, Mean (95% CI)

p-value

Mean (95% CI)

p-value

 

Number of sex partners with condomless anal sex in the last 3 months

Baseline

1.05 (0.77 to 1.32)

    

0.85 (0.57 to 1.12)

    

0.20 (-0.19 to 0.59)

0.316

0.043b

3-month follow-up

0.88 (0.45 to 1.31)

-0.17 (-0.57 to 0.23)

0.937

  

1.16 (0.73 to 1.58)

0.31 (-0.08 to 0.70)

0.171

  

-0.28 (-0.88 to 0.32)

0.361

 

6-month follow-up

0.78 (0.52 to 1.05)

-0.26 (-0.52 to -0.01)

0.039

-0.09 (-0.45 to 0.27)

1.000

0.91 (0.66 to 1.17)

0.07 (-0.17 to 0.31)

1.000

-0.24 (-0.59 to 0.11)

0.286

-0.13 (-0.50 to 0.24)

0.486

 
  1. a p-values were obtained by generalized linear mixed-effects models with logit links. There were no adjustments in the models.
  2. b p-values were obtained by linear mixed-effects models. There were no adjustments in the models.
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