From: The effect of curcumin ointment on knee pain in older adults with osteoarthritis: a randomized placebo trial
Pain change
Group
P value a
Intervention
Placebo
First (T1-T2)
1.64 ± 0.79
0.56 ± 0.87
<  0.001
Second (T1-T3)
2.33 ± 1.06
0.58 ± 1.05
< 0.001
P value b
0.002
0.930