Fig. 1: Willingness-to-pay.

Willingness-to-pay for the program using teleconsultation, Bluetooth feature of BP machine, or 1 year shorter duration of the program measured by a the price of blood pressure (BP) machine and b the monthly fee. The base “reference population” comprise of those who were male, married, with higher income, with more formal education years, full-time worker, aged at 55 years to below 65 years, and with a digital skills score of 36 (median). Digital skills score was calculated with a summation (reverse scored) of the 10 adapted 5-point Likert scale questions on the mastery in the use of digital technologies, and a higher score is indicative of having higher mastery. Digital skills score at the 25th percentile (“digital skills 25th pct”) and at the 75th percentile (“digital skills 75th pct”) have a 6- and 5-point difference from the median score. The “low SES female” comprise of subgroup of participants that were female, with fewer formal education years, and lower income. Error bars indicate the 95% confidence intervals of the willingness-to-pay.