Table 1

Description of Studies Included in Review

First Author (Publication Date), Study Name, Reference Number

Baseline Sample Population

Year Started

Baseline Sample Size

Interval Between Data Collections

Evaluation Year(s)

Data Collection Method

Retention Method (s)

Response Ratesa,b


Randomised Studies of Retention Strategies

Doody (2003) US Radiologic Technologists (USRT) Study, [22]

Adults

1984-1987*

132 454 2700 1

8-10 Years

1995-1997

Postal

RCT of monetary incentives

72% 23% RCT

Kalsbeek (1995) 1993-1994 Self-Care Assessment of Community Based Elderly, [23]

Adults 67+

1991

3485

2 Years

1993-1994

Telephone

RCT of advance packets with non-monetary incentives

78%

Koo (1996) The Canadian Study of Diet, Life-Style and Health, [24]

Girls aged 5-13

1992

657

1 Year

1995

Postal

RCT of reminder letters

74% 55% RCT

Laurie (2007) British Household Panel Survey (BHPS), [25,26]

Households

1991*

10 264

1 Year

2004

Face-to-Face

RCT of monetary incentives

85%

Olson (2008) National Longitudinal Survey of Youth in 1979 (NLS79), [27-30]

Youth and young adults aged 14-22

1979*

12 686

1-2 Years

2000

Mixed

RCT of monetary incentives

83% 32% RCT

Olson (2008) National Longitudinal

Women aged 20-44

1967

5159

1-2 Years

2001

Mixed

RCT of monetary and non-monetary incentives

46%

Surveys of Young Women and Mature Women (NLSW), [27-30]

Women aged 14-24

1968

5083 766 1

9 Years

54% 30% RCT

Olson (2008) National Longitudinal Survey of Youth in 1997 (NLS97), [27-30]

Youth aged 12-17

1997*

8984 3,8251

1 Year

2006

Face-to-Face

RCT of monetary incentives

84% 65% RCT

Rimm (1990) Health Professionals Follow-up Study, [31]

Males aged 40-75

1986*

51 672

1-2 Years

1988

Postal

RCT of mailing methods

93% 69% RCT

Rodgers (unpublished) Health and Retirement Study (HRS), [32]

Adults aged 60+

1992*

12 654

2 Years

2000

Telephone

RCT of monetary incentives

88%

White (2005) VITamins And Lifestyle (VITAL) Study, [33]

Adults aged 50-76

2000*

77 700 452 1

2 Years

2002

Postal

RCT of non-monetary incentive

84% 34% RCT

Non-Randomised Studies of Retention Strategies

Boys (2003), [34]

Youth aged 15-16

2000

540

1 Year

2001-2002

Postal

Reminder methods and alternative methods of data collection

92%

Calle (2002) Cancer Prevention Study II (CPS-II) Nutrition Cohort, [35]

Adults aged 50-74

1992*

184 194

2 Years

2003

Postal

Repeated questionnaire postings and alternative methods of data collection

90%

Clarke (1998) Whitehall I Study, [36]

Males aged 40-69

1967

19 019

25 Years

1995

Postal

Repeated questionnaire postings and reminder methods

73%

Eagan (2002), [37]

Adults aged 15-70

1985

3370

11 Years

1996-1997

Postal

Reminder methods

89%

Garcia (2005) Cornella Health Interview Survey Follow-up (CHIS.FU) Study, [38]

All ages

1994

2500

8 Years

2002

Telephone

Multiple telephone calls and alternative methods of data collection

68%

Harding (2007) The DASH (Determinants of Adolescent Social well-being and Health) Study, [39]

Youth aged 11-13

2003*

6643

2 Years

2005

Face-to-Face

Multiple school visits

72%

Hoffman (1998) CLUE II Study, [40]

Adults aged 18+

1989*

28411 2000 2 812 3

6 Years

1995

Postal

RCT of questionnaire length, non-RCT of non-monetary incentives, non-RCT of re-posting of questionnaire and reminder postcard

72% 34% Pilot 1 46% Pilot 2 16% Pilot 3

Lissner (2003) Population Study of Women in Gothenburg, Sweden, [41]

Females aged 38-60

1968*

1462

6-8 Years

2000-2002

Face-to-Face

Alternative methods of data collection

72%

Michaud (2005) NIH-AARP Diet and Health Study, [42]

Adults aged 50-69

1995*

567 169

10 Years

2002

Postal

Multiple postings of questionnaire and alternative methods of data collection

76%

Mills (2000), [43]

Youth aged 11-12

1992

1614

1 Year

1995-1997

Face-to-Face

Alternative methods of data collection

91%

Novo (1999), [44]

Youth aged 16

1981*

1083

5 Years

1986

Face-to-Face

Alternative methods of data collection

98%

Rudy (1994), [45]

Women aged 20-35

1993

221

1 Month

1993

Postal

Non-RCT of monetary and non-monetary incentives

72%

Russell (2001) Black Women's Health Study (BWHS), [46]

Women aged 21-69

1995*

64 500

2 Years

1997

Postal

Multiple postings of questionnaire, reminder methods and alternative

83%

Tolusso (2003) National Population Health Survey (NPHS), [47]

All ages

1994*

17 276

2 Years

2003

Telephone

Multiple telephone calls and alternative methods of data collection

81%

Ullmann (1998) UCLA Study of Adolescent Growth, [48]

Youth aged 12-16

1976*

1634

1 Year

1992

Postal

Reminder methods, multiple postings of questionnaire and monetary incentive

68%

Walker (2000) British Regional Heart Study (BRHS), [49]

Males aged 40-59

1978*

7735

2-9 Years

1983-1985

Postal

Reminder methods

88%

Women's Health Australia Research Group (2001) Women's Health Australia (WHA) Study, [50-53]

Women aged 18-23 Women aged 45-50 Women aged 70-75

1996*

14 247 13 716 12 432

2 Years

1998-2000

Postal

Reminder methods and alternative methods of data collection

71% 92% 89%


a Retention rates at time of publication

b Overall study retention rates follow ed by retention rates from RCTs or pilot studies

° Personal communication

* Study still active

1Trial s amplesiz e

2Pilot 2

3Non-respondent to pilot 2

Booker et al. BMC Public Health 2011 11:249   doi:10.1186/1471-2458-11-249

Open Data