From: Tolerability and efficacy of a combination of paracetamol and caffeine in the treatment of tension-type headache: a randomised, double-blind, double-dummy, cross-over study versus placebo and naproxen sodium
PCF
NAP
PLA
SPID
n
91
Baseline intensity (SE)
2.0 (0.06)
2.1 (0.07)
2.1 (0.08)
Mean (SE)
4.0 (0.35)
4.2 (0.38)
2.1 (0.35)
TOTPAR
81
8.5 (0.60)
8.0 (0.63)
4.8 (0.60)