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Table 2 Incidence Rate Ratios (IRR) with 95% confidence intervals for effects of treatment, time and treatment-time interaction on behaviour and affect scores after taking account of age, gender and dementia severity

From: A randomized, controlled cross-over trial of dermally-applied lavender (Lavandula angustifolia) oil as a treatment of agitated behaviour in dementia

   Behaviour Affect
     Positive Negative
   IRR p value IRR p value IRR p value
Treatment Lavender compared to control 0.884 (0.778-1.004) 0.057 1.072 (0.848-1.355) 0.56 0.891 (0.504-1.573) 0.690
Time First 30 minutes post-exposure compared to pre- exposure 0.899 (0.793-1.020) 0.097 0.900 (0.706-1.147) 0.393 0.960 (0.550-1.675) 0.887
Second 30 minutes post-exposure compared to pre- exposure 0.858 (0.755-0.974) 0.018 0.865 (0.678-1.106) 0.248 0.641 (0.348-1.179) 0.153
Treatment- time interactions Lavender x first 30 min. post-exposure 0.961 (0.798-1.157) 0.672 1.020 (0.726-1.433) 0.910 0.848 (0.371-1.938) 0.696
  Lavender x second 30 min post-exposure 1.045 (0.869-1.259) 0.636 0.954 (0.675-1.348) 0.790 0.687 (0.269-1.750) 0.431