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Table 3 Spearman correlation coefficients for cesarean rates by plurality and gestational age subgroups in 2008

From: Varying gestational age patterns in cesarean delivery: an international comparison

Subgroups Overall Singletons Multiples
≥22 wks 26-31 wks 32-36 wks 37-38 wks 39-41 wks ≥42 wks <34 wks 34-36 wks ≥37 wks
Singletons    
26-31 GA 0.16 1  
32-36 GA 0.86* 0.45 1  
37-38 GA 0.83* 0.39 0.89* 1  
39-41 GA 0.86* -0.05 0.60* 0.51* 1  
≥42 GA 0.81* -0.00 0.70* 0.63* 0.76* 1  
Multiples         
<34 GA 0.80* 0.24 0.67* 0.64* 0.59* 0.58* 1   
34-36 GA 0.80* -0.03 0.73* 0.62* 0.59* 0.60* 0.76* 1  
≥37 GA 0.77* -0.10 0.70* 0.57* 0.58* 0.57* 0.71* 0.98* 1
  1. Notes: Asterisks indicate p < 0.05. Gestational age (GA) in completed weeks (wks).