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Table 4 Mixed effects logistic regressions with practice as a fixed effect showing combinations of invitation methods

From: Pre-notification and reminder SMS text messages with behaviourally informed invitation letters to improve uptake of NHS Health Checks: a factorial randomised controlled trial

Parameter Estimate
(β)
Standard Error Z-value P-value Odds Ratio (OR) 95% Confidence Interval for OR
Lower Upper
Variation between Practice 0.190 0.04 2.96 0.002    
Intercept −1.750 0.11 −13.14 .000    
NoPre_Open-ended_Rem 0.521 0.129 4.03 0.000 1.684 1.307 2.170
NoPre_Open-ended_NoRem 0.248 0.132 1.88 0.060 1.281 0.990 1.658
NoPre_Timeltd_Rem 0.476 0.128 3.73 0.000 1.609 1.253 2.066
NoPre_Timeltd_NoRem 0.143 0.132 1.08 0.282 1.153 0.890 1.495
NoPre_Social_Norms_Rem 0.339 0.130 2.6 0.009 1.403 1.087 1.812
NoPre_Social_Norms_NoRem 0.077 0.132 0.58 0.560 1.080 0.834 1.397
NoPre_Ctr_Rem 0.302 0.125 2.42 0.016 1.353 1.059 1.728
Pre_Open-ended_Rem 0.325 0.130 2.5 0.012 1.384 1.073 1.786
Pre_Open-ended_NoRem 0.416 0.127 3.27 0.001 1.516 1.182 1.945
Pre_Timeltd_Rem 0.620 0.127 4.91 0.000 1.860 1.451 2.383
Pre_Timeltd_NoRem 0.377 0.128 2.95 0.003 1.457 1.134 1.872
Pre_Social_Norms_Rem 0.316 0.128 2.47 0.014 1.372 1.067 1.764
Pre_Social_Norms_NoRem 0.306 0.130 2.36 0.018 1.358 1.053 1.752
Pre_Ctr_Rem 0.313 0.128 2.45 0.014 1.367 1.065 1.756
Pre_Ctr_NoRem 0.213 0.131 1.63 0.104 1.237 0.958 1.598
GENDER (Ref: Female) −0.314 0.044 −7.09 0.000 0.730 0.670 0.797
Asian (Ref: White) 0.006 0.113 0.06 0.955 1.006 0.807 1.255
Black 0.255 0.053 4.79 0.000 1.291 1.163 1.433
Other −0.087 0.078 −1.11 0.268 0.917 0.786 1.069
Not stated/not known −2.322 0.120 −19.36 0.000 0.098 0.078 0.124
Dep Quintile 2 (Ref: Quintile 1) 0.015 0.052 0.29 0.772 1.015 0.917 1.123
Dep Quintile 3 0.040 0.092 0.43 0.667 1.041 0.868 1.247
Dep Quintile 4 −0.150 0.166 −0.91 0.365 0.860 0.622 1.191
Dep Quintile 5 −0.192 0.389 −0.49 0.621 0.825 0.385 1.768
Dep Quintile Unknown 0.212 0.419 0.51 0.613 1.236 0.544 2.810
Age at invitation 0.012 0.003 4.49 0.000 1.012 1.007 1.018
  1. Residual maximum likelihood estimate of model parameters (β), Pre = Pre-notification, Rem = Reminder; Ctr = control letter, Open-ended = Open-ended letter, Timeltd = Time-limited letter, Social_Norms = Social norms letter
  2. Reference category: no prenotifcaiton, control letter and no reminder