A Bland–Altman plot for single mobile method was constructed with 50 readings. The plot is shown in Fig. 11. Our proposed method using single mobile yielded an accuracy of 95% confidence intervals of ±2.4473 mmHg in systolic pres- sure and 95% confidence intervals of ±1.7073 mmHg in diastolic pressure from a data set comprising of 500 measurements obtained from both male and female between an age range of 21–55 years.