Skip to main content

Table 4 The results from the sensitivity analysis

From: An exploration of the missing data mechanism in an Internet based smoking cessation trial

Parameter β 2  = − 4 β 2  = − 3 β 2  = − 2 β 2  = − 1 β 2  = 0 β 2  = 1 β 2  = 2 β 2  = 3 β 2  = 4
  (P a  = 0.94) (P a  = 0.85) (P a  = 0.68) (P a  = 0.44) (P a  = 0.22) (P a  = 0.10) (P a  = 0.04) (P a  = 0.01) (P a  = 0.00)
β 1,1 (Treatment) -0.073(0.163) -0.072(0.149) -0.081(0.127) -0.088(0.106) -0.091(0.099) -0.094(0.102) -0.095(0.104) -0.097(0.106) -0.097(0.107)
β 1,2 (Age) 0.038(0.008) 0.035(0.007) 0.033(0.006) 0.030(0.005) 0.028(0.005) 0.027(0.005) 0.026(0.005) 0.026(0.005) 0.025(0.005)
β 1,3 (Sex) 0.005(0.172) 0.036(0.157) 0.070(0.133) 0.102(0.111) 0.131(0.104) 0.152(0.107) 0.165(0.110) 0.171(0.111) 0.174(0.112)
β 1,4 (Qualifications) 0.072(0.077) 0.073(0.070) 0.072(0.061) 0.071(0.051) 0.072(0.047) 0.073(0.049) 0.071(0.050) 0.069(0.050) 0.067(0.050)
β 1,5 (Deprivation) -0.253(0.088) -0.222(0.079) -0.175(0.067) -0.116(0.055) -0.066 (0.051) -0.036(0.053) -0.024(0.054) -0.020(0.054) -0.018(0.054)
β 1,6 (Conscientiousness) -0.230(0.097) -0.208(0.089) -0.177(0.076) -0.139(0.064) -0.105(0.060) -0.084(0.062) -0.074(0.063) -0.069(0.064) -0.067(0.064)
β 1,7 (Determination) 0.240(0.114) 0.206(0.103) 0.153(0.087) 0.089(0.073) 0.034(0.067) 0.001(0.069) -0.015(0.071) -0.022(0.071) -0.024(0.072)
β 1,8 (Support) 0.131(0.067) 0.121(0.062) 0.107(0.052) 0.087(0.044) 0.069(0.041) 0.057(0.042) 0.051(0.043) 0.049(0.044) 0.048(0.044)
β 1,9 (Dependence) 0.059(0.059) 0.055(0.052) 0.039(0.043) 0.016(0.036) -0.001(0.034) -0.011(0.035) -0.015(0.035) -0.017(0.036) -0.018(0.036)
β 1,10 (Previous) -0.020(0.169) -0.041(0.153) -0.084(0.131) -0.138(0.109) -0.183(0.103) -0.211(0.105) -0.224(0.108) -0.228(0.109) -0.230(0.110)
  1. The coefficients β 1,1 to β 1,10 describe the effect of each of the ten baseline covariates in Table 2. The tabulated P a  = P(Y = 1|R = 0,x) are obtained from equation (4) with logit(P(Y = 1|R = 1,x)) = logit(0.22)and the corresponding value of β 2. Statistically significant estimates, at the 5% level, are shown in bold and standard errors are in parentheses.