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Table 4 Grocery pharmacy contraceptive sales negative binomial regression results by study group and time

From: Impact of a passive social marketing intervention in community pharmacies on oral contraceptive and condom sales: a quasi-experimental study

  Estimate SE LB UB t P value
Condom Sales       
intervention (vs. comparison) 0.43 0.36 −0.28 1.14 1.21 0.228
time 2 (vs. 1) −0.07 0.06 −0.19 0.05 −1.13 0.263
time 3 (vs. 1) −0.62 0.06 −0.74 −0.50 −10.32 <0.001
time 3 (vs. 2) −0.55 0.06 −0.67 −0.44 −9.19 <0.001
intervention * time 2 (vs. 1) 0.14 0.12 −0.10 0.38 1.15 0.253
intervention * time 3 (vs. 1) 0.19 0.12 −0.05 0.43 1.60 0.113
intervention * time 3 (vs. 2) 0.05 0.12 −0.19 0.29 0.45 0.652
Oral Contraceptive
intervention (vs. comparison) −0.20 0.16 −0.52 0.11 −1.28 0.205
time 2 (vs. 1) −0.07 0.02 −0.10 −0.03 −3.62 <0.001
time 3 (vs. 1) −0.02 0.02 −0.06 0.02 −1.11 0.269
time 3 (vs. 2) 0.05 0.02 0.01 0.08 2.50 0.014
intervention * time 2 (vs. 1) 0.02 0.04 −0.06 0.09 0.42 0.675
intervention * time 3 (vs. 1) −0.01 0.04 −0.08 0.06 −0.25 0.803
intervention * time 3 (vs. 2) −0.02 0.04 −0.10 0.05 −0.67 0.504
  1. Main effect and interaction estimates and p values are computed with contrast tests in the regression.
  2. Interaction terms reference category is always control.
  3. LB = Lower Bound, UB = Upper Bound for a 95% Confidence Interval.