Table 4

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

IR interquartile range.

a difference between CATI and MQ was statistically significant (p < 0.05).

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.

Rocheleau et al.

Rocheleau et al. BMC Public Health 2012 12:579   doi:10.1186/1471-2458-12-579

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