From: A comparative study between rheumatoid arthritis and osteoarthritis regarding association of insomnia with disease status
N
Mean ± SD
P value
Post-hoc test
RA patients
20
9.85 ± 4.793
< 0.001
P1 < 0.001**
OA patients
2.50 ± 2.373
P2 < 0.001**
Control group
1.25 ± 1.209
P3 = 0.22