“…Of note, 16 studies included in the qualitative analysis compared UCA in sPTBs and term births in pregnancies without symptoms of preterm labor, with all 16 studies showing a significant difference. 13 , 16 , 18 , 19 , 20 , 21 , 22 , 24 , 25 , 27 , 28 , 29 , 30 , 31 , 32 , 34 Of the 16 studies, 15 were included in the quantitative analysis, as shown in Figure 6 . 13 , 16 , 18 , 19 , 20 , 21 , 22 , 24 , 25 , 27 , 28 , 29 , 30 , 31 , 32 , 34 Of the 5925 patients included, UCA was significantly larger in the sPTB group than in the term birth controls (MD, 16.29; 95% CI, 13.38–19.20; P <.00001; I 2 =78%).…”