barely significantp≈0.05
The variation among populations from the former administrative provinces was small and of uncertain significance (0.38%, p≈0.05); no significant results were obtained when the samples were grouped into physico-geographical regions – the Black Sea coast, the Danubian Plain, Thrace and the southwest mountainous region, and only barely significant variation among groups (0.49%, p≈0.05) was unexpectedly revealed when the samples were assigned to three broader geographical regions - Eastern, Central and Western Bulgaria.