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Table 2 Associations of trait anxiety with gestation length in women with sponteneous deliveries, provider-intitiated deliveries, and all deliveries

From: Is maternal trait anxiety a risk factor for late preterm and early term deliveries?

   Spontaneous deliveriesa Provider-initiated deliveries All deliveries
  Gestation lengthb Late preterm Early term Full term (reference) Late preterm Early term Full term (reference) Late preterm Early term Full term (reference)
  N 1812 9701 56 527 1 007 4535 7824 2819 14054 64351
Unadjusted analyses   OR (95% CI)c OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI)
Anxiety groupsd Very high 1.5 (1.1-2.0) 1.3 (1.2-1.5) - 1.7 (1.2-2.3) 1.3 (1.0-1.6) - 1.8 (1.4-2.2) 1.4 (1.3-1.6) -
  High 1.2 (0.9-1.6) 1.0 (0.9-1.2) - 0.9 (0.6-1.2) 1.0 (0.9-1.3) - 1,2 (1.0-1.5) 1.1 1.0-1.2) -
  Low 1.2 (1.1-1.4) 1.1 (1.0-1.1) - 1.1 (1.0-1.3) 1.1 (1.0-1.2) - 1.2 (1.2-1.4) 1.1 (1.1-1.2) -
  Very low (reference) - - - - - - - - -
Adjusted analyses   OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI) OR (95% CI)
Anxiety groups Very high 1.4 (1.0-1.8) 1.3 (1.1-1.5) - 1.7 (1.2-2.4) 1.3 (1.0-1.6) - 1.7 (1.3-2.0) 1.4 (1.3-1.6) -
  High 1.1 (0.9-1.5) 1.0 (0.9-1.1) - 0.9 (0.6-1.3) 1.0 (0.9-1.3) - 1.1 (0.9-1-4) 1.1 (1.0-1.2) -
  Low 1.2 (1.0-1.3) 1.0 (1.0-1.1) - 1.1 (1.0-1.2) 1.1 (1.0-1.2) - 1.2 (1.1-1.3) 1.1 (1.1-1.2) -
  Very low (reference) - - - - - - - - -
  1. aSpontaneous deliveries = deliveries beginning by spontaneous labor or spontaneous rupture of the membranes
  2. bLate preterm: weeks 34-36; early term: weeks 37-38; full term: weeks 39-41
  3. cOR (95% CI): Odds Ratio and 95% Confidence Interval
  4. dCut-points at mean, and ± 2 standard deviations. ‘Very low’ = 1.0-1.25; ‘low to mean = 1.26-1.95; ‘mean to high’ = 1.96-2.30; ‘high’ = 2.31-4.00