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Table 1 Interview process details: number of timestamped entries, response time and corrections

From: Paradata analyses to inform population-based survey capture of pregnancy outcomes: EN-INDEPTH study

Indicator Overall FPH FBH+ P value$
Mean (SD) Median Range   Median Range Mean (SD) Median Range
N timestamped entries per interviewa 55.1 (33.4) 48 1–335 57.7 (34.9) 52 1–335 52.5 (31.5) 45 6–289 < 0.001
N questions answered per 1 interview 50.7 (29.6) 44 1–223 53.2 (31.1) 49 1–223 48.4 (27.8) 41 6–194 < 0.001
Response time per 1 interviewb, min 10.8 (14.3) 7.3 0.06–179.9 11.4 (14.8) 7.8 0.06–179.9 10.3 (13.3) 6.9 0.23–179.8 < 0.001
Response time per 1 questionb, min 0.4 (3.5) 0.08 0–179.9 0.4 (3.6) 0.08 0–179.9 0.4 (3.6) 0.07 0–179.9  
N corrected questions per 1 interview 3.8 (4.8) 2 0–112 3.9 (4.9) 3 0–112 3.6 (4.8) 2 0–110 < 0.001
N corrected question per 10 questions 0.8 (0.9) 0.6 0–29.5 0.8 (0.9) 0.6 0–29.5 0.8 (0.9) 0.62 0–20.4 < 0.01
N corrections per 1 interview 4.4 (6.2) 3 0–227 4.6 (6.3) 3 0–227 4.2 (6.1) 2 0–149 < 0.01
Time spent on correction per 1 interview, min 1.9 (10.2) 0.3 0–179.6 2.0 (10.2) 0.3 0–174.5 1.9 (10.2) 0.2 0–179.6 < 0.01
Time spent on correction per 1 question, min 0.6 (5.6) 0.08 0–179.9 0.6 (5.5) 0.08 0–179.8 0.6 (5.6) 0.08 0–179.9  
Response time per 1 interview, if all corrections avoided, min 9.4 (10.1) 6.9 0.06–179.5 9.9 (10.6) 7.4 0.06–179.5 8.8 (9.4) 6.5 0.2–179.4 < 0.001
Response time per 1 question, if corrections avoided, min 1.7 (4.5) 0.8 0.5–177.1 1.7 (4.5) 0.8 0.5–177.1 1.7 (4.5) 0.9 0.5–176.1  
N interviews, n (%) 65,768 (100.0) 32,744 (49.8) 33,024 (50.2)  
N interviews with at least 1 correction, n (%) 55,066/65,768 (83.7) 27,721/32,744 (84.6) 27,345/33,024 (82.8)  
  1. Total percentages may not add up or exceed one hundred due to rounding up
  2. FPH full pregnancy history module, FBH+ full birth history module with additional questions on pregnancy losses
  3. $P values for independent sample t test that compared means for two groups
  4. aAll timestamped entries, including answer corrections
  5. bAll answers, accounting for correction time