Table 1. Call outcomes and rates for the C4H interactive voice response, random digit dial mobile phone sample [using American Association for Public Opinion Research standards [13].

Interview (Category 1)
Complete (1.1)	9469
Partial (1.2)	3547
Eligible, non-interview (Category 2)
Break-off/refusal (2.12)	2987
Unknown eligibility, non-interview (Category 3)
No screener completed (3.21)	1196
Unknown if person is HH resident (3.3)	27626
Not eligible (Category 4)
Unknown if number is valid, call did not connect (4.31)	918277
Under age (4.70)	2024
Other (Call connected but no/invalid selection) (4.9)	111402
Total phone numbers used	1076528
I = Complete interviews (1.1)	9469
P = Partial interviews (1.2)	3547
R = Refusal and break-off (2.1)	2987
NC = Non contact (2.2)	0
O = Other (2.0, 2.3)	0
Calculating e:a	.88
UH = Unknown household (3.1)	0
UO = Unknown other (3.2–3.9)	28822
Response Rates
Response rate 1: I/(I+P) + (R+NC+O) + (UH +OU)	21.1
Response rate 2: (I+P)/(I+P) + (R+NC+O) + (UH+OH)	29.0
Response rate 3: I/((I+P) + (R+NC+O) + e(UH+UO))	22.8
Response rate 4: (I+P)/((I+P) + (R+NC+O) + e(UH+UO))	31.3
Cooperation Rates
Cooperation rate 1 [&3]: I/(I+P)+R+O)	59.17
Cooperation rate 2 [&4]: (I+P)/((I+P)+R+O))	81.33
Refusal Rates
Refusal rate 1: R/((I+P)+(R+NC+O) + UH + UO))	6.7
Refusal rate 2: R/((I+P)+(R+NC+O) + e(UH + UO))	7.2
Refusal rate 3: R/((I+P)+(R+NC+O))	18.7
Contact Rates
Contact rate 1: (I+P)+R+O / (I+P)+R+O+NC+ (UH + UO)	35.7
Contact rate 2: (I+P)+R+O / (I+P)+R+O+NC + e(UH+UO)	38.5
Contact rate 3: (I+P)+R+O / (I+P)+R+O+NC	100.0
Survey length, costs, and productivity
Average survey length (mins)	9:50
Average estimated cost per interview	USD 4.95
Telephone numbers used to get a survey start	23
Telephone numbers used to get an eligible contact	67
Telephone numbers used to get an interview (full + partial)	83

^ae is estimated as the proportion of all respondents screened for eligibility who were eligible.