Skip to main content

Table 2 Call characteristics and AAPOR call disposition by method

From: Estimation of bed net coverage indicators in Tanzania using mobile phone surveys: a comparison of sampling approaches

 

Combined methods

RDD method only

Opt-in method only

Calls

 Total calls placed

310,151

142,946

167,205

 Total unique numbers called

246,233 (79.4%)

138,728 (97.0%)

107,505 (64.3%)

Call disposition

 (NC) Non-contacts

82,485 (33.5%)

55,673 (40.1%)

26,812 (24.9%)

 (R) Refusals & break-offs

127,375 (51.7%)

74,741 (53.9%)

52,634 (49.0%)

 (P) Partial interviews

3,192 (1.3%)

1,551 (1.1%)

1,641 (1.5%)

 (I) Completed interviews

3,020 (1.2%)

1,462 (1.1%)

1,558 (1.4%)

 (O) Other

5,448 (2.2%)

2,053 (1.5%)

3,395 (3.2%)

 Ineligible respondents†

27,733 (11.3%)

4,710 (3.4%)

23,023 (21.4%)

AAPOR designations

 Contact rate 3 (CON3): (I+P)+R+O/(I+P)+R+NC+O

62.2%

58.5%

68.3%

 Response rate 5 (RR5): I/((I+P)+(R+NC+O))

1.4%

1.1%

1.8%

 Response rate 6 (RR6): (I+P)/((I+P)+(R+NC+O))

1.5%

1.2%

1.9%

 Cooperation rate 1 (COOP1): I/(I+P) + R+O)

2.2%

1.9%

2.7%

 Cooperation rate 2 (COOP2): (I+P)/((I+P)+R+O))

2.3%

2.0%

2.8%

 Refusal rate 3 (R3): R/((I+P)+(R+NC+O))

58.3%

55.8%

62.3%

Survey Details

 Average survey length (I + P)

9 min 51 s

9 min 49 s

9 min 52 s

  1. RDD random digit dial; AAPOR: American Association of Public Opinion Research min minutes; sec seconds
  2. †Not an official AAPOR designation—ineligible respondents were under the age of 18 years or were excluded from participation because their call exceeded the regional quota