TABLE 2

Disposition of the Y6FU Sample and Various AAPORa Response Rates

DispositionSubtotalTotal
Total responding to IFPSII neonatal questionnaire3033
 Disqualified based on information during IFPSII data collection75
 Total qualified for Y6FU based on IFPSII2958
  (IM) Interview, mail: completed mail questionnaire1455
  (IT) Interview, telephoneb: completed telephone interview87
  (RM) Refused, mail: eligible and contacted, refused by mail18
  (RT) Refused, telephone: eligible and contacted, refused telephone interview64
  (NCM) No contact, mail: contact for mail survey not successful and no telephone interview attempted375
  (NCT) No contact, telephone: contact for telephone interview not successful585
  (CSU) Contact status unknown374
(I) Interview: total completed questionnaires = IM + IT1542
(R) Refused: eligible and contacted, refused = RM + RT82
(NC) No contact: eligible but contact not successful = NCM + NCT960
Response rate 1 = I/(I + R + NC + CSU) = 1542/2958c52.1%
Cooperation rate 1 = I/(I + R) = 1542/1624c,d95.0%
Refusal rate 1 = R/(I + R + NC + CSU) = 82/2958c2.8%
Contact rate 1 = (I + R)/(I + R + NC + CSU) = 1624/2958c54.9%
  • a Response rate equations can be found in ref 8.

  • b Telephone interviews attempted = (Qualified − NCM − RM − IM) = 2958 − 375 − 18 − 1455 = 1110.

  • c This calculation assumes that all sample members with contact status unknown (CSU) were not contacted.

  • d The cooperation rate is the percentage of completes among those known to have been contacted.