. 2019 Apr 12;7(4):e10809. doi: 10.2196/10809

Table 4.

Comparison of hypertension app domain and overall quality scores by cost, presence of educational content, and user rating (n=62).

Domain	Free (n=38)	Paid (n=24)	P value	No education (n=50)	Education (n=12)	P value	<4 stars (n=57)	≥4 stars (n=5)	P value
Overall quality score	12.7 (5.2)^a	12.1 (4.0)^a	.63	11.8 (4.8)^a	15.1 (3.8)^a	.03	12 (9-15)^b	19 (15-20)^b	.02
BP^c tracking usefulness score	9.8 (4.1)^a	9.5 (3.1)^a	.71	9.2 (3.7)^a	11.5 (3.0)^a	.06	10 (7-12)^b	13 (11-15)^b	.04
BP tracking features, median (IQR^d)	4 (2-5)	4 (3-4)	.41	4 (2-5)	4 (3-5)	.32	4 (2-5)	5 (4-6)	.12
Data validation. median (IQR)	1 (0-1)	1 (0-1)	.55	1 (0-1)	1 (0-2)	.20	1 (0-1)	1 (1-2)	.47
BP analytical features, median (IQR)	6 (4-7)	5.5 (4-7)	.80	5 (3-7)	7 (5-7)	.09	5 (4-7)	7 (6-8)	.05
HON^e quality, median (IQR)	2.5 (1-5)	2 (2-4)	.73	2 (1-4)	3.5 (2-5)	.07	2 (1-4)	5 (4-6)	.01
Functional characteristics, median (IQR)	3 (2-4)	2 (2-3)	.44	2 (2-3)	3.5 (3-7)	<.001	2 (2-4)	3 (3-5)	.22
Education comprehensiveness, median (IQR)	2 (2-5)	2 (1-2)	.20	—^f	—	—	—	—	—

^aData are presented as mean (SD).

^bData are presented as median (IQR). Aggregate BP usefulness and overall quality scores were normally distributed for each comparison group except by 4-star rating. All single-item domain scores were not normally distributed.

^cBP: blood pressure.

^dIQR: interquartile range.

^eHON: Health on the Net.

^fNot applicable.