. Author manuscript; available in PMC: 2023 Nov 9.

Published in final edited form as: Int J Alcohol Drug Res. 2021 Jun 30;9(1):30–42. doi: 10.7895/ijadr.289

Table 2.

Dates, modes of data collection, and number of questions

	Wave 1	Wave 2	Wave 3	Wave 4	Wave 4 online supplemental survey

Field dates	April 2000 to October 2001	July 2003 to May 2005	May 2010 to August 2012	April 2017 to July 2019	April 2017 to July 2019
Mode(s) of data collection	PAPI	CAPI	CAPI	CATI	Online self-administered Qualtrics survey
Number of Questions	355 (poss. 1006 with follow-up)	417 (poss. 1300)	Original sample 426 (poss. 1750) RDS sample 447 (poss. 1914)	467 (poss. 785)	12 open-ended 59 close-ended

Note: PAPI - paper and pencil in-person interview; CAPI - computer assisted in person interview; CATI – computer-assisted telephone interview. Number of follow-up questions substantially fewer for participants who reported not having consumed alcohol in the previous 12 months. Single participants asked 1–25 fewer questions, depending on survey wave.