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Table 1 Basic patient characteristics: comparison of the analysed study population and patients lost to follow-up

From: The predictive value of sequential cervical length screening in singleton pregnancies after cerclage: a retrospective cohort study

  Analzyed patients Lost to follow-up p
(n = 88) (n = 33)
Age (years)c 31 (29;36) 32 (27;38) 0.828
Body mass index (kg/m2)c 24.1 (20.9; 28.5) 22.2 (21.1;26.4) 0.604
Previous preterm deliveryd 40 (45.5) 15 (45.5) 1.000
Previous second trimester miscarriaged 59 (67.0) 20 (60.6) 0.508
Previous conizationd 15 (17.0) 4 (12.1) 0.587
Pregnancy after IVF treatmentd 5 (5.7) 4 (12.1) 0.254
Urinary tract infection during pregnancyd 2 (2.3) 3 (9.1) 0.124
Parity 0 19 (21.6) 8 (24.2) 0.932
  1 31 (35.2) 11 (33.3)
  ≥2 38 (43.2) 14 (42.4)
Cigarette smokingd 15 (17.0) 3 (9.1) 0.392
Gestational age at cerclagec 16 (16;18) 16 (16;18) 0.496