Table 1. Characteristics of 10 CMWs and associations with SARS-CoV-2 seropositivity, indicated by detectable antibodies in serologic samples, Qatar*.
| Characteristic | No. (%)† tested | SARS-CoV-2 seropositive |
Univariable regression analysis |
Multivariable regression analysis‡ |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| No. | %§ (95% CI) | p value | OR (95% CI) | p value¶ | OR (95% CI) | p value# | ||||
| Sex | ||||||||||
| M | 4,721 (95.0) | 3,153 | 66.8 (65.4–68.1) | <0.001 | Referent | Referent | ||||
| F |
249 (5.0) |
46 |
18.5 (13.9–23.9) |
|
|
0.11 (0.08–0.16) |
<0.001 |
|
0.13 (0.09–0.19) |
<0.001 |
| Age, y | ||||||||||
| <29 | 1,579 (31.8) | 1,031 | 65.3 (62.9–67.6) | <0.001 | Referent | Referent | ||||
| 30–39 | 1,973 (39.7) | 1,226 | 62.1 (60.0–64.3) | 0.87 (0.76–1.00) | 0.052 | 0.90 (0.78–1.05) | 0.178 | |||
| 40–49 | 1,040 (20.9) | 680 | 65.4 (62.4–68.3) | 1.00 (0.85–1.18) | 0.962 | 1.12 (0.93–1.35) | 0.216 | |||
| >50 | 339 (6.8) | 225 | 66.4 (61.1–71.4) | 1.05 (0.82–1.34) | 0.705 | 1.21 (0.92–1.59) | 0.170 | |||
| Missing |
39 (0.8) |
37 |
94.9 (82.7–99.4) |
|
|
9.83 (2.36–40.95) |
0.002 |
|
9.57 (2.22–41.32) |
0.002 |
| Nationality | ||||||||||
| Other** | 125 (2.5) | 40 | 32.0 (23.9–40.9) | <0.001 | Referent | Referent | ||||
| Filipino | 186 (3.7) | 68 | 36.6 (29.6–43.9) | 1.22 (0.76–1.98) | 0.408 | 2.23 (1.32–3.75) | 0.003 | |||
| Sri Lankan | 147 (3.0) | 77 | 52.4 (44.0–60.7) | 2.34 (1.42–3.84) | 0.001 | 2.81 (1.66–4.76) | <0.001 | |||
| Kenyan | 152 (3.1) | 77 | 50.7 (42.4–58.9) | 2.18 (1.33–3.57) | 0.002 | 3.43 (1.99–5.90) | <0.001 | |||
| Indian | 1,647 (33.1) | 1,035 | 62.8 (60.5–65.2) | 3.59 (2.44–5.30) | <0.001 | 3.60 (2.40–5.41) | <0.001 | |||
| Nepalese | 2,136 (43.0) | 1,468 | 68.7 (66.7–70.7) | 4.67 (3.17–6.88) | <0.001 | 4.93 (3.27–7.42) | <0.001 | |||
| Bangladeshi |
577 (11.6) |
434 |
75.2 (71.5–78.7) |
|
|
6.45 (4.23–9.82) |
<0.001 |
|
6.78 (4.31–10.66) |
<0.001 |
| CMW community | ||||||||||
| 5 | 443 (8.9) | 243 | 54.9 (50.1–59.6) | <0.001 | Referent | Referent | ||||
| 4 | 534 (10.7) | 330 | 61.8 (57.5–65.9) | 1.33 (1.03–1.72) | 0.028 | 1.12 (0.83–1.52) | 0.449 | |||
| 10 | 957 (19.3) | 620 | 64.8 (61.7–67.8) | 1.51 (1.20–1.90) | <0.001 | 1.30 (1.02–1.65) | 0.034 | |||
| 7 | 188 (3.8) | 122 | 64.9 (57.6–71.7) | 1.52 (1.07–2.17) | 0.020 | 1.31 (0.91–1.89) | 0.154 | |||
| 6 | 1,505 (30.3) | 946 | 62.9 (60.4–65.3) | 1.39 (1.12–1.73) | 0.002 | 1.32 (1.06–1.66) | 0.015 | |||
| 2 | 456 (9.2) | 282 | 61.8 (57.2–66.3) | 1.33 (1.02–1.74) | 0.034 | 1.46 (1.08–1.96) | 0.013 | |||
| 9 | 202 (4.1) | 126 | 62.4 (55.3–69.1) | 1.36 (0.97–1.92) | 0.074 | 1.71 (1.18–2.48) | 0.005 | |||
| 8 | 139 (2.8) | 93 | 66.9 (58.4–74.6) | 1.66 (1.12–2.48) | 0.013 | 1.92 (1.25–2.95) | 0.003 | |||
| 1 | 255 (5.1) | 193 | 75.7 (69.9–80.8) | 2.56 (1.82–3.61) | <0.001 | 2.52 (1.75–3.62) | <0.001 | |||
| 3 | 291 (5.9) | 244 | 83.8 (79.1–87.9) | 4.27 (2.97–6.15) | <0.001 | 3.49 (2.41–5.07) | <0.001 | |||
*CMW, craft and manual worker; OR, odds ratio; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2. †Percentage of total sample. ‡Pseudo-R2 value in the multivariable logistic regression model is 7.1%. §Percent seropositive of those tested. ¶Covariates with p <0.2 in univariable analysis (i.e., sex, age, nationality, and CMW community) were included in the multivariable analysis. #Covariates with p <0.05 in multivariable analysis (i.e., sex, nationality, and CMW community) were considered predictors of SARS-CoV-2 seropositivity. **Includes all other nationalities that contributed <10% of the sample in each community. These are: Canadian, Egyptian, Ethiopian, Georgian, Ghanaian, Indonesian, Iraqi, Jordanian, Lebanese, Nigerian, Pakistani, Palestinian, Somali, Tanzanian, Tunisian, Ugandan, and Yemeni.