Table 5 The Spearman’s rank correlation coefficients (r ^s ) of gestation age and infant’s birth weight with periodontal conditions of postpartum mothers and their demographic, and obstetric factors (n = 400)

  Bleeding gum

-0.005

0.921

-0.002

0.961

  Pocket depth of 4–5 mm

0.047

0.352

0.061

0.225

  Pocket depth ≥ 6 mm

0.037

0.457

0.035

0.491

  Calculus

0.019

0.699

0.011

0.823

  Gingival recession

0.071

0.156

0.120*

0.017

Demographic variables

  Age of the mother

0.065

0.383

0.045

0.123

  Level of education

0.031

0.546

0.022

0.668

  Employment

0.012

0.061

0.0115*

0.034

  Marital status

0.037

0.464

0.063

0.210

  Parity

0.001

0.988

-0.015

0.774

  Type of delivery

-0.045

0.375

-0.026

0.608

Obstetric factors

  No. of ANC attendance

0.084

0.092

0.025

0.617

  Aneamia

0.004

0.932

0.006

0,898

  Labour onset

-0.017

0.740

-0.021

0.673

  Vaginal bleeding

0.039

0.440

0.022

0.661

  Medication

0.009

0.857

0.008

0.872

  Repture of membranes

0.072

0.152

0.075

0.136

  Features of chorioamnionitis

0.123*

0.014

0.125*

0.012