Study Arm
No Demographics Integrated Demographics Optional Demographics
Main Survey
Number fielded 1484 1481 1482
Number returned undeliverable 0 1 0
Number completed 507 489 491
Response rate (%) 34.2 33 33.1
Demographics Survey
Number fielded 0 1481 1482
Number completed 0 484 420
Response rate (%) NA 32.7* 28.3