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Table 4 Response characteristics of participants in HOEPS pilot, by survey instrument and case or control status

From: Effect of survey instrument on participation in a follow-up study: a randomization study of a mailed questionnaire versus a computer-assisted telephone interview

 

Cases Median (IR)

Controls Median (IR)

Total Median (IR)

Mothers

N = 138

N = 130

N = 268

 Time to completion (days) a

   

  CATI

29.0 (15.0 – 56.0)

29.0 (13.0 – 43.0)

29 (14.0 - 51.5)

  MQ

20.0 (13.0 – 35.0)

17.0 (9.0 – 39.0)

17 (10.0 - 35.0)

 Number of reminders a,b

   

  CATI

6.0 (4.0 – 9.0)

6.0 (4.0 – 8.0)

6.0 (4.0 - 8.0)

  MQ

3.0 (2.0 – 5.0)

3.0 (2.0 – 4.0)

3.0 (2.0 - 4.0)

 Time elapsed from child’s birth to completion of HOEPS (years)

   

  CATI

2.9 (2.2 - 3.2)

2.6 (2.1 - 3.2)

2.8 (2.2 - 3.2)

  MQ

2.7 (2.3 - 3.3)

2.6 (2.1 - 3.2)

2.6 (2.2 - 3.3)

Fathers

N = 81

N = 66

N = 147

 Time to completion (days)

   

  CATI

28.0 (14.0- 53.5)

21.0 (16.0 – 42.0)

28.0 (14.0 - 49.0)

  MQ

20.0 (13.0- 41.0)

16.0 (10.0 – 41.0)

17.0 (10.0 - 41.0)

 Number of reminders a,b

   

  CATI

6.0 (4.0 - 6.5)

5.0 (4.0 – 7.0)

6.0 (4.0 - 7.0)

  MQ

3.0 (1.0 - 5.0)

2.0 (1.0 – 5.0)

3.0 (1.0 - 5.0)

 Time elapsed from child’s birth to completion of HOEPS (years)

   

  CATI

3.1 (2.6 - 3.4)

2.6 (2.3 – 3.5)

3.0 (2.4- 3.5)

  MQ

2.9 (2.4 – 3.4)

2.7 (2.3 – 3.2)

2.8 (2.3- 3.3)

  1. IR interquartile range.
  2. a difference between CATI and MQ was statistically significant (p < 0.05).
  3. b This includes reminder letters and calls; a reminder call consists of up to 4 call attempts. Participants who returned the MQ without a reminder, or who called in to schedule/complete an interview after receiving the introductory packet, had 0 reminders.