Table 1 Search strategies using PubMed database from January 2000 to February 5, 2023

1

Hypertension, blood pressure

206,741

2

Female, male, adult, middle-aged, aged, older

153,260

3

1 and 2

4271

4

Short message OR message system OR SMS OR text messaging OR mobile phone text message OR text message reminder OR reminder systems OR digital health OR telemedicine

136,918

5

3 AND 4

35

6

Treatment adherence/or treatment compliance/or patient acceptance of health care or patient compliance/or medication adherence/

397,913

7

Medication or drug or pharmacological or therapeutic or treatment or adherence or compliance or concordance

19,445,227

8

Patient medication or drug or pharmacological or therapeutic or treatment or knowledge or understanding or awareness or adherence or compliance or attitude or practice

18,428,612

9

6 or 7 or 8

20,428,855

10

5 and 9

33

11

Double-blind method/or clinical trials/or clinical trials, phase I as topic/or clinical trials, phase ii as topic/or clinical trials, phase iii as topic/or clinical trials, phase iv as topic/or controlled clinical trials as topic/or randomized controlled trials as topic/or early termination of clinical trials topic/or multicenter studies as topic/

1,517,297

12

(randomized adj4 trial) or (controlled adj3 trial) or (clinical adj2 trial) or ((single or double or tripl or treb) and (blind or mask)) or ("4 arms" or "four arms")

62,328

13

"clinical trial" or "clinical trial, phase i" or "clinical trial, phase ii" or clinical trial, phase iii or clinical trial, phase iv or controlled clinical trial or "multicenter study" or "randomized controlled trial."

1,457,599

14

11 or 12 or 13

1,823,699

15

10 and 14

15