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Table 4 Respondents’ preferences for HPV vaccination based on a panel mixed logit model [N = 294]

From: Parents’ preferences for vaccinating daughters against human papillomavirus in the Netherlands: a discrete choice experiment

Attributes   Coefficient
   Value (95% CI)
Constant (vaccination) Mean -3.18 ***a (-4.50 to -1.86)
  S.D. 9.26 *** (7.62 to 10.9)
Degree of protection against cervical cancer (per 10%) Mean 1.18b *** (0.99 to 1.36)
  S.D. 0.75 *** (0.60 to 0.90)
Duration of protection 6 years (omitted)c Mean -2.37 *** (-2.72 to -2.03)
  S.D. 1.46 *** (1.41 to 1.51)
Duration of protection 25 years Mean 0.56 *** (0.40 to 0.72)
  S.D. 0.36 *** (0.10 to 0.62)
Duration of protection lifetime Mean 1.81 *** (1.51 to 2.11)
  S.D. 1.42 *** (1.14 to 1.70)
1/750,000 risk of serious side effects (omitted)c Mean 3.04 *** (2.54 to 3.55)
  S.D. 3.18 *** (2.98 to 3.38)
1/150,000 risk of serious side effects Mean 0.62 *** (0.37 to 0.86)
  S.D. 0.70 *** (0.42 to 0.98)
1/30,000 risk of serious side effects Mean -3.66 *** (-3.06 to -4.25)
  S.D. 3.11 *** (2.45 to 3.77)
Vaccination at age 9 years (omitted)c Mean -0.65 *** (-0.86 to -0.44)
  S.D. 0.32 *** (0.30 to 0.33)
Vaccination at age 12 years Mean 0.11   (-0.06 to 0.29)
  S.D. 0.29 *** (0.10 to 0.48)
Vaccination at age 14 years Mean 0.54 *** (0.36 to 0.72)
  S.D. 0.29 *** (0.10 to 0.48)
Model fits     
Log-Likelihood function    -1205.62  
Akaike information criterion    0.93  
Bayesian information criterion    0.96  
Pseudo R-squared    0.58  
  1. Notes: Effects coded variables used for protection duration, serious side effects, and age at vaccination; Normal distribution for random coefficients used on all attributes; Number of observations = 7938 (i.e. 294 respondents completed 9 choice sets containing 3 response options each).
  2. a***Denotes p < .01; bWhen looking at an HPV vaccination that generates a 50%, 70% or 90% protection rate, the coefficient should be multiplied five, seven or nine times; cThe value of the omitted term equals the negative sum of the coefficients.