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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