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Table 1 OD (OD600 nm) scale levels used for classification of the tested isolates according to their biofilm formation capabilities (Mohamed et al. 2013)

From: Biofilm formation by Streptococcus mutans and its inhibition by green tea extracts

OD value Biofilm formation
OD ≤ 2* ODca Weak biofilm producer
2*ODc ≤ OD ≤ 4*ODc Moderate biofilm producer
4*ODc ≤ OD Strong biofilm producer
  1. aODc is OD of the control wells