Table 4.

Description of the subject categories used in analysis, the AUC performance and the sensitivity at 95% specificity obtained using the BLSTM classifier.

Subject sub-population	Count COVID/Non-COVID	AUC (%)	Sensitivity at 95% specificity	p-value
Gender
Male	51/209	92.7 (89.3–95.4)	64.7 (37.3–76.7)	0.901
Female	45/82	90.3 (85.1–95.1)	64.4 (48.9–80.0)	0.814
Age
15–30	39/143	90.0 (85.1–94.3)	59.0 (41.7–76.5)	0.179
30–45	20/86	89.8 (80.8–96.4)	55.0 (33.3–76.5)	0.242
45–60	22/35	94.4 (89.6–98.6)	68.2 (32.1–95.5)	0.590
60–90	8/6	91.7 (75.0–100.0)	50.0 (25.0–100.0)	0.129
Vaccination
With	66/57	86.3 (80.8–91.3)	31.8 (14.1–70.4)	p < 0.050
Without	30/234	88.8 (82.3–93.9)	53.3 (31.2–78.9)	0.260
Mask
With	45/36	83.8 (76.1–90.6)	46.7 (12.2–70.2)	p < 0.050
Without	51/255	90.9 (86.4–94.9)	64.7 (50.0–80.7)	0.151
English Proficiency
With	87/280	91.4 (88.4–94.2)	58.6 (48.8–75.6)	0.899
Without	9/11	86.9 (71.0–100.0)	44.4 (16.7–100.0)	0.379
Date of Collection
Before Dec. 21	47/147	91.1 (86.6–94.8)	55.3 (44.7–75.0)	0.114
After Dec. 21	49/144	92.3 (88.5–95.8)	63.3 (38.6–78.2)	0.123
Collection Province
Karnataka	50/95	95.4 (91.6–98.3)	82.0 (42.6–97.3)	0.444
Others	46/196	88.5 (83.9–92.7)	54.3 (38.6–74.4)	0.568
Prevalence
20%	72/288	90.9 (87.5–94.0)	63.6 (45.6–72.7)	0.814
10%	32/288	91.2 (86.4–95.4)	63.1 (40.3–77.0)	0.783
5%	15/285	88.9 (80.4–95.7)	56.0 (29.1–75.2)	0.574
2.5%	7/273	88.8 (82.8–98.0)	51.4 (34.0–87.6)	0.542

The p-values correspond to the t-test performed between scores from the full test set and the ones from the population sub-group considered.