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Table 4 Effect of intervention on outcomes – per-protocol sample

From: Effect of short-term psychological intervention on anxiety of pregnant women with positive screening results for chromosomal disorders: a randomized controlled trial

Variables Cognitive- behavioral educations group (n = 46) Control group (n = 46) MDe (CIf 95%) ESg (Between) P-value (Between groups)
Mean (SD a) ES h (within) Mean (SD a) ES h (within)
State anxiety
bPre intervention 63.88 (6.34) 59.90 (7.63) 3.98 (0.93 to7.02) 0.011
cPost intervention 38.21 (9.35) 2.68 66.14 (11.35) 0.63 −30.44 (− 34.72 to − 26.16) 0.71 <  0.001
dP-value (within groups) <  0.001 <  0.001  
Trait anxiety
bPre intervention 57.76 (10.09) 55.71 (11.12) 2.095 (− 2.56 to 6. 75) 0.374
cPost intervention 36.02 (7. 5) 2.17 63.97 (11.76) 0.69 −28.96 (− 32.65 to - 25.27) 0.75 <  0.001
dP-value (within groups) <  0.001 <  0.001  
  1. aStandard Deviation
  2. bIndependent-samples t-test
  3. cANCOVA
  4. dPaired-sample T Test
  5. eMean Difference
  6. fConfidence Interval
  7. gEffect size (ES) based on partial eta square
  8. hEffect sizes based on Cohen’s d