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These findings show that in the long term, nocturnal dip is more stable when expressed as a continuous variable. As recent evidence show cardiovascular risk to be inversely related to nocturnal blood pressure in a continuous manner, surely it makes more sense to express nocturnal dip in a similar way to aid stratification of overall cardiovascular risk.

With regard to current BHS guidelines, ABPM is generally unnecessary in the assessment of hypertension in patients with diabetes, provided careful 'clinic' measurements of blood pressure are made.

All 15 SpaceLabs recorders measured consistently over the 6 years with 89.5% of the differences in average pressures, recorded by any particular device at each recorded pressure, less than 2 mmHg between successive test episodes. The maximum difference was 4.5 mmHg and 60.1% of the differences were less than 1 mmHg. The measurements for all devices were within the tolerances specified by the supplier for the device when tested with the simulator. Maintenance records also show that most devices required breakdown maintenance less than once every 3 years. The results show that the SpaceLabs devices maintain measurement consistency in the demanding conditions of ambulatory pressure recording over several years.