Table 2.

Comparison of positive and negative mood between groups and within groups receiving lavender and Placebo at any point in time and over time

Variable	Lavender			Placebo			Lavender & placebo
Positive PANAS	Mean (SD)	Mean change (95% CI)	P*	Mean (SD)	Mean change (95% CI)	P*	Mean difference (95% CI)	P**
Before	22.7 (3.35)	-		22.36 (3.01)	-		0.33 (-1.98 to 1.31)	0.687&
28 days later	30.08 (5.91)	7.38 (5.23 to 9.52)	< 0.001	25 (3.56)	2.63 (1.29 to 3.97)	< 0.001	4.54 (2.06 to 7.02)	0.001
56 days later	30.84 (5.59)	8.14 (6.14 to 10.13)	< 0.001	24.6 (3.94)	2.24 (0.88 to 3.6)	0.002	5.85 (3.43 to 8.26)	< 0.001
P***	<0.001			<0.001
Between the lavender and placebo groups	Mean difference (95% CI)			P****			P*****
	3.82 (1.81 to 5.83)			< 0.001			< 0.001
Negative PANAS	Lavender			Placebo			Lavender & placebo
	Mean (SD)	Mean change (95% CI)	P*	Mean (SD)	Mean change (95% CI)	P*	Mean difference (95% CI)	P**
Before	27.36 (3.12)			26.8 (2.83)			-0.566 (-2.1 to 0.97)	0.465&
28 days later	19.64 (3.89)	-7.72 (-9.43 to -6.01)	< 0.001	23.82 (3.33)	-2.97 (-4.44 to -1.5)	< 0.001	-3.5 (-5.33 to -1.68)	< 0.001
56 days later	19.28 (3.86)	-8.08 (-9.77 to -6.4)	< 0.001	23.86 (3.63)	-2.93 (-4.53 to -1.32)	0.001	-4.26 (-6.26 to -2.25)	< 0.001
P***	<0.001			<0.001
Between the lavender and placebo groups	Mean difference (95% CI)			P****			P*****
	-2.23 (-3.61 to -0.85)			0.002			0.001

P^*: Repeated measure ANOVA (Comparison of each time point with the baseline); P^**: Between‑group p values after intervention with ANCOVA adjusted for baseline and age (comparison of lavender group and placebo at each time point); P^***: Within-group repeated measure ANOVA ; P^****: Between‑group repeated measure ANOVA adjusted for age during the time; P^*****: Greenhouse-Geisser or Sphericity Assumed test adjusted for age (time and group interaction); SD: Standard deviation; CI: Confidence interval; &: Independent T-test