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Table 2 Successful follow-up visits standardized by duration and date of shift type: a comparison within subgroups

From: Improving retention of community-recruited participants in HIV prevention research through Saturday household visits; findings from the HPTN 071 (PopART) study in South Africa

Subgroups

Early weekday shift

Late weekday shift

Saturday shift

P value*

Days (n)

87

259

41

 

Duration 36 field teams active (hours)

684

2,053

205

 

Total

 Successful visits n

3,069

10,713

2,869

 

 Mean successful visits per hour (95%CI)

4.5 (3.7-5.3)

5.3 (4.7-5.8)

14.0 (11.3-16.6)

<0.001

Sex: male

 Successful visits n

894

2,978

942

 

 Mean successful visits per hour (95%CI)

1.3 (1.1-1.5)

1.5 (1.3-1.6)

4.6 (3.7-5.5)

<0.001

Sex: female

 Successful visits n

2,175

7,735

1,927

 

 Mean successful visits per hour (95%CI)

3.2 (2.6-3.7)

3.8 (3.4-4.2)

9.4 (7.6-11.2)

<0.001

Age: 18-24 years

 Successful visits n

1,083

3,463

916

 

 Mean successful visits per hour (95%CI)

1.6 (1.3-1.9)

1.7 (1.5-1.9)

4.5 (3.6-5.3)

<0.001

Age: 25-34 years

 Successful visits n

1,184

4,274

1,154

 

 Mean successful visits per hour (95%CI)

1.7 (1.4-2.0)

2.1 (1.9-2.3)

5.6 (4.5-6.7)

<0.001

Age: >34 yearsa

 Successful visits n

802

2,975

799

 

 Mean successful visits per hour (95%CI)

1.2 (0.9-1.4)

1.5 (1.3-1.6)

3.9 (3.1-4.7)

<0.001

PC round: PC12

 Successful visits n

1,961

6,137

1,668

<0.001

 Mean successful visits per hour (95%CI)

2.9 (2.1-3.6)

3.0 (2.5-3.6)

8.1 (5.3-10.9)

 

PC round: PC24

 Successful visits n

1,108

4576

1,201

 

 Mean successful visits per hour (95%CI)

1.6 (0.9-2.3)

2.2 (1.8-2.7)

5.9 (2.9-8.8)

<0.001

Study period: July – December 2015

 Successful visits n

1,630

4,505

1,110

 

 Mean successful visits per hour (95%CI)

2.4 (1.6-3.1)

2.2 (1.7-2.8)

5.4 (2.4-8.4)

<0.001

Study period: January – June 2016

 Successful visits n

331

1,632

558

 

 Mean successful visits per hour (95%CI)

0.5 (0.2-0.7)

0.8 (0.6-1.0)

2.7 (1.3-4.1)

<0.001

Study period: July – December 2016

 Successful visits n

868

1,817

537

 

 Mean successful visits per hour (95%CI)

1.3 (0.6-1.9)

0.9 (0.5-1.2)

2.6 (0.3-4.9)

<0.001

Study period: January – July 2017

 Successful visits n

240

2,759

664

 

 Mean successful visits per hour (95%CI)

0.4 (0.1-0.6)

1.3 (1.0-1.7)

3.2 (0.9-5.5)

<0.001

Community: Triplet 1

 Successful visits n

897

3,631

906

 

 Mean successful visits per hour (95%CI)

1.3 (1.0-1.6)

1.8 (1.6-1.9)

4.4 (3.5-5.4)

<0.001

Community: Triplet 2

 Successful visits n

1,143

3,944

1,138

 

 Mean successful visits per hour (95%CI)

1.7 (1.3-1.9)

1.9 (1.7-2.2)

5.6 (4.5-6.6)

<0.001

Community: Triplet 3

 Successful visits n

1,069

3,138

825

 

 Mean successful visits per hour (95%CI)

1.5 (1.2-1.8)

1.5 (1.3-1.7)

4.0 (3.1-4.9)

<0.001

  1. *ANOVA test was done to calculate if there was a statistically significant difference between the mean successful visits of each shift type within a subgroup. Successful visits were standardized by hour for each day during the study period
  2. aThe eldest participant was 46 years, therefore the number of subgroups was restricted to three age groups. One individual had age missing
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BMC Medical Research Methodology

ISSN: 1471-2288

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