Threshold values for hypertension (different sources do not agree on common values)? -

Define notion of quot;pre-hypertensionquot;

As you have mentioned in your question, different sources will show different ranges for hypertension. However, almost all of the studies and medical text books, agree on that the blood pressure above 140 mmHG systolic and 90 mmHg diastolic is a risk factor for atherosclerotic diseases.