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Table 7 Estimated between-group differences in changes over time for predicted means on the Perceived Stress Scale (PSS), with confidence intervals and chi square statistic.

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

  Placebo vs Control Fish oil vs Control Fish oil vs Placebo
Estimate 2.786 6.059 3.273
95% CI sep 3.289 3.046 3.943
95% CI joint 4.692 4.345 5.625
Chi square 2.754 15.193* 2.647
  1. * Significance determined by observed value of 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, chi sq = chi square, vs = versus, the difference between groups