Table 3

Association of antibiotic prescribing rate for self limiting respiratory tract infection with use of decision support tools, by age group

Fourth of decision support tool useRTI consultations with DST viewed (%)Antibiotic prescribing for respiratory tract infection/No of person years)
AllAge 0-14 yearsAge 15-84 yearsAge ≥85 years
Usual care trial arm27 923/259 519.76432/46 019.620 811/207 611.4680/5888.7
Lowest fourth0 to 0.67190/85 805.11932/15 699.95089/68 220.1169/1885.1
Second fourth0.6 to 2.97765/74 868.31706/12 009.45837/60 825.5222/2033.4
Third fourth2.9 to 6.110 647/91 986.92339/15 233.47957/74 735.5351/2018.0
Highest fourth6.1 to 27.66305/70 495.11520/10 883.64668/58 060.1117/1551.3
Relative risk reduction (%; 95% CI) per fourth increase in decision support tools*†3.4 (0.1 to 6.5)1.60 (−2.7 to 5.7)4.3 (1.1 to 7.5)1.0 (−4.6 to 6.3)
P value0.04
  • * Adjusted for random effect of general practice and fixed effects of sex, age group, comorbidity, region, quarter in study, practice specific rate at baseline, and interaction with period.

  • Rate ratio represents the reduction in antibiotic prescribing per fourth increase in decision support tools.