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Table 5 Predicted changes over time in estimates of Perceived Stress Scale (PSS) means for each treatment group, 95% confidence intervals, and chi square value.

From: An adaptogenic role for omega-3 fatty acids in stress; a randomised placebo controlled double blind intervention study (pilot) [ISRCTN22569553]

  Control Placebo Fish oil
Estimate -0.500 -3.285 -6.559
95% CI sep 1.509 2.923 2.646
95% CI joint 2.152 4.170 3.755
Chi square 0.421 4.852* 23.590*
  1. * significance determined by chi sq ≥ 3.84, the critical value of chi square for df = 1 when p ≤0.05. Note: 95% CI sep = 95% confidence interval considering each item separately, 95% CI joint = 95% confidence interval, considering the estimates of the three treatment groups collectively, df = degrees of freedom