Blood Pressure Estimation Using Photoplethysmography Only: Comparison between Different Machine Learning Approaches

Table 2

Estimated BPs (SBP and DBP) from the regression tree with their corresponding reference BPs and their difference. The results are given separately for each case.

Case	SBP (mmHg)			DBP (mmHg)
	Reference BP	Estimated BP	Difference	Reference BP	Estimated BP	Difference
1	96.8	97.1	−0.3	49.1	49.1	0.0
2	102.1	112.0	−9.9	43.2	64.7	−21.5
3	98.7	100.7	−1.9	53.1	53.1	0.0
4	107.5	108.1	−0.6	58.2	58.6	−0.3
5	139.6	135.7	4.0	71.8	69.3	2.5
6	112.3	108.3	4.1	58.4	56.7	1.7
7	91.5	96.3	−4.8	44.4	46.8	−2.5
8	103.6	105.3	−1.8	52.1	53.1	−1.0
9	103.0	100.7	2.4	46.0	46.0	−0.1
10	118.4	107.1	11.3	51.8	50.5	1.3
11	109.9	111.0	−1.1	67.4	66.0	1.4
12	89.6	93.5	−3.9	53.0	53.2	−0.2
13	101.2	101.8	−0.6	64.4	61.5	2.9
14	84.8	86.9	−2.1	56.7	56.4	0.3
15	84.5	87.6	−3.1	49.6	52.4	−2.8
16	85.0	86.6	−1.6	56.2	57.3	−1.1
17	92.9	105.1	−12.1	57.5	59.4	−1.9
18	113.6	117.7	−4.1	59.3	62.6	−3.2
19	116.9	116.3	0.6	58.1	63.9	−5.8
20	115.2	115.7	−0.6	59.8	62.8	−3.0
21	94.4	103.0	−8.6	45.4	51.2	−5.7
22	128.3	117.7	10.7	59.7	60.1	−0.4
23	148.4	132.4	16.1	80.5	71.1	9.4
24	95.0	100.0	−5.0	61.4	70.1	−8.7
25	124.2	123.1	1.0	65.8	63.6	2.1
26	121.3	116.1	5.2	59.0	60.5	−1.6
27	124.0	118.6	5.4	71.1	68.2	2.8
28	108.3	115.0	−6.7	59.6	62.4	−2.8
29	103.2	101.6	1.6	61.3	60.3	1.0
30	108.0	118.3	−10.3	71.1	63.3	7.8
31	118.0	118.7	−0.7	72.3	69.8	2.5
32	147.2	135.1	12.0	77.4	71.6	5.8
Mean	108.9	109.1	−0.1	59.2	59.8	−0.6
SD	16.8	12.8	6.5	9.4	7.2	5.2