Table 1.
Baseline characteristics of the study participants.
| Variable | Categories | Overall | Positive | Crude seroprevalence |
|---|---|---|---|---|
| 95% CI | ||||
| Sex | Female | 10980 | 3615 | 0·33 (0·32–0·34) |
| Male | 6880 | 2193 | 0·32 (0·31–0·33) | |
| Missing | 3 | 3 | 1 (0·44–1) | |
| Age class | [5,10] | 1150 | 418 | 0·36 (0·34–0·39) |
| (10,18] | 2267 | 861 | 0·38 (0·36–0·4) | |
| (18,40] | 6365 | 2200 | 0·35 (0·33–0·36) | |
| (40,60] | 4982 | 1580 | 0·32 (0·3–0·33) | |
| (60,100] | 2964 | 708 | 0·24 (0·22–0·25) | |
| Missing | 135 | 44 | 0·33 (0·25–0·41) | |
| Socioeconomic strata | 1 | 3979 | 1914 | 0·48 (0·47–0·5) |
| 2 | 6571 | 2205 | 0·34 (0·32–0·35) | |
| 3 | 5424 | 1323 | 0·24 (0·23–0·26) | |
| 4 | 1173 | 203 | 0·17 (0·15–0·2) | |
| 5 | 259 | 39 | 0·15 (0·11–0·2) | |
| 6 | 156 | 15 | 0·1 (0·06–0·15) | |
| Missing | 301 | 112 | 0·37 (0·32–0·43) | |
| Comorbidities | None | 12759 | 4240 | 0·33 (0·32–0·34) |
| 1–3 | 4022 | 1209 | 0·3 (0·29–0·31) | |
| 4+ | 71 | 18 | 0·25 (0·17–0·37) | |
| Missing | 1011 | 344 | 0·34 (0·31–0·37) | |
| Race | White | 3409 | 954 | 0·28 (0·27–0·3) |
| Afro | 1265 | 637 | 0·5 (0·48–0·53) | |
| Indigenous | 779 | 398 | 0·51 (0·48–0·55) | |
| Mestizo | 8855 | 2701 | 0·31 (0·3–0·31) | |
| Other | 1264 | 372 | 0·29 (0·27–0·32) | |
| Missing | 2291 | 749 | 0·33 (0·31–0·35) | |
| Civil Status | Single | 7306 | 2296 | 0·31 (0·3–0·33) |
| Married | 3693 | 991 | 0·27 (0·25–0·28) | |
| Cohabiting | 3630 | 1409 | 0·39 (0·37–0·4) | |
| Widower | 680 | 197 | 0·29 (0·26–0·32) | |
| Divorced | 600 | 173 | 0·29 (0·25–0·33) | |
| Other | 1721 | 667 | 0·39 (0·36–0·41) | |
| Missing | 233 | 78 | 0·33 (0·28–0·4) | |
| Educational level | Elementary | 4807 | 1763 | 0·37 (0·35–0·38) |
| High school | 6333 | 2209 | 0·35 (0·34–0·36) | |
| Technical degree | 2689 | 788 | 0·29 (0·28–0·31) | |
| Bachelor degree + | 2687 | 577 | 0·21 (0·2–0·23) | |
| None | 1055 | 386 | 0·37 (0·34–0·4) | |
| Missing | 292 | 88 | 0·3 (0·25–0·36) | |
| Occupation | Student | 3940 | 1379 | 0·35 (0·34–0·37) |
| Employed | 3985 | 1186 | 0·3 (0·28–0·31) | |
| Independent | 3253 | 1079 | 0·33 (0·32–0·35) | |
| Housewife | 3632 | 1226 | 0·34 (0·32–0·35) | |
| Informal worker | 350 | 162 | 0·46 (0·41–0·52) | |
| Retired | 809 | 133 | 0·16 (0·14–0·19) | |
| Unemployed | 1436 | 499 | 0·35 (0·32–0·37) | |
| Missing | 458 | 147 | 0·32 (0·28–0·37) | |
| Health insurance affiliation | Private | 9586 | 2575 | 0·27 (0·26–0·28) |
| Public | 6894 | 2727 | 0·4 (0·38–0·41) | |
| None | 958 | 374 | 0·39 (0·36–0·42) | |
| Unknown | 45 | 13 | 0·29 (0·18–0·43) | |
| Missing | 380 | 122 | 0·32 (0·28–0·37) | |
| Access to sewage | Yes | 16621 | 5123 | 0·31 (0·3–0·32) |
| No | 1103 | 639 | 0·58 (0·55–0·61) | |
| Missing | 139 | 49 | 0·35 (0·28–0·43) | |
| Access to electricity | Yes | 17580 | 5713 | 0·32 (0·32–0·33) |
| No | 114 | 45 | 0·39 (0·31–0·49) | |
| Missing | 169 | 53 | 0·31 (0·25–0·39) | |
| Number of people per household | 1,2 | 4957 | 1355 | 0·27 (0·26–0·29) |
| 3,4 | 7511 | 2283 | 0·3 (0·29–0·31) | |
| 5,6 | 3269 | 1233 | 0·38 (0·36–0·39) | |
| 7+ | 1779 | 827 | 0·46 (0·44–0·49) | |
| Missing | 347 | 113 | 0·33 (0·28–0·38) | |
| Number of rooms per household | 1 | 1353 | 545 | 0·4 (0·38–0·43) |
| 2 | 4871 | 1685 | 0·35 (0·33–0·36) | |
| 3 | 7127 | 2167 | 0·3 (0·29–0·31) | |
| 4 | 2808 | 854 | 0·3 (0·29–0·32) | |
| 5+ | 1565 | 524 | 0·33 (0·31–0·36) | |
| Missing | 139 | 36 | 0·26 (0·19–0·34) | |
| Contact with COVID–19 patient | Yes | 2843 | 1268 | 0·45 (0·43–0·46) |
| No | 13531 | 4001 | 0·3 (0·29–0·3) | |
| Missing | 1489 | 542 | 0·36 (0·34–0·39) | |
| Usage of facemask | Yes | 15076 | 4756 | 0·32 (0·31–0·32) |
| No | 562 | 271 | 0·48 (0·44––0·52) | |
| Missing | 2225 | 784 | 0·35 (0·33–0·37) | |
| Daily frequency of handwashing | 0 times | 226 | 100 | 0·44 (0·38–0·51) |
| 1–3 times | 2381 | 885 | 0·37 (0·35–0·39) | |
| 4,5 times | 3042 | 947 | 0·31 (0·3–0·33) | |
| 6+ times | 9998 | 3090 | 0·31 (0·3–0·32) | |
| Missing | 2216 | 789 | 0·36 (0·34–0·38) | |
| Influenza vaccine during last year | Yes | 2726 | 860 | 0·32 (0·3–0·33) |
| No | 14722 | 4824 | 0·33 (0·32–0·34) | |
| Missing | 415 | 127 | 0·31 (0·26–0·35) | |
| City | Barranquilla | 1426 | 697 | 0·49 (0·46–0·51) |
| Bogota | 4515 | 1186 | 0·26 (0·25–0·28) | |
| Bucaramanga | 1425 | 398 | 0·28 (0·26–0·3) | |
| Cali | 1983 | 524 | 0·26 (0·25–0·28) | |
| Cucuta | 1454 | 508 | 0·35 (0·33–0·37) | |
| Guapi | 721 | 423 | 0·59 (0·55–0·62) | |
| Ipiales | 1465 | 445 | 0·3 (0·28–0·33) | |
| Leticia | 1417 | 726 | 0·51 (0·49–0·54) | |
| Medellin | 1987 | 464 | 0·23 (0·22–0·25) | |
| Villavicencio | 1470 | 440 | 0·3 (0·28–0·32) | |
| Overall | - | 17863 | 5811 | 0·33 (0·32-0·33) |