Table 1
Sample Details.
| Covariates | Patients (%) | Employees (%) |
|---|---|---|
| N | 1282 | 337 |
| Age (years) | ||
| 10–19 | 26 (2.0) | 31 (9.2) |
| 20–29 | 210 (16.4) | 160 (47.5) |
| 30–39 | 370 (28.9) | 77 (22.8) |
| 40–49 | 298 (23.2) | 41 (12.2) |
| 50–59 | 229 (17.9) | 21 (6.2) |
| 60–69 | 149 (11.6) | 7 (2.1) |
| Sex | ||
| Males | 692 (54.0) | 150 (44.5) |
| Females | 590 (46.0) | 187 (55.5) |
| Institution | ||
| Eg | 288 (22.5) | 80 (23.7) |
| Neevengaarden | 279 (21.8) | 84 (24.9) |
| Dale | 207 (16.1) | 53 (15.7) |
| Valen | 192 (15.0) | 47 (14.0) |
| Opdal | 137 (10.7) | 36 (10.7) |
| Rosenberg | 95 (7.4) | 20 (5.9) |
| Møllendal | 84 (6.6) | 17 (5.0) |
Table 2
Morbidity and case fatality among patients and employees.
| Patients (N = 1282) | Employees (N = 337) | |||
|---|---|---|---|---|
| Morbidity (%) | Case Fatality (%) | Morbidity (%) | Case Fatality (%) | |
| Total | 305 (23.8) | 30 (9.8) | 180 (53.4) | 2 (1.1) |
| Age (years) | ||||
| 10–19 | 10 (38.5) | 0 (0) | 23 (74.2) | 0 (0) |
| 20–29 | 75 (35.7) | 9 (12.0) | 103 (64.4) | 1 (1.0) |
| 30–39 | 100 (27.0) | 12 (12.0) | 35 (45.5) | 1 (2.9) |
| 40–49 | 56 (18.8) | 6 (10.7) | 12 (29.3) | 0 (0) |
| 50–59 | 48 (21.0) | 1 (2.1) | 6 (28.6) | 0 (0) |
| 60–69 | 16 (10.7) | 2 (12.5) | 1 (14.3) | 0 (0) |
| Sex | ||||
| Males | 166 (24.0) | 17 (10.2) | 70 (46.7) | 1 (1.4) |
| Females | 139 (23.6) | 13 (9.4) | 110 (58.8) | 1 (0.9) |
| Institution | ||||
| Eg | 48 (16.7) | 1 (2.1) | 48 (60.0) | 0 (0) |
| Neevengaarden | 78 (28.0) | 1 (1.3) | 36 (42.9) | 1 (2.8) |
| Dale | 30 (14.5) | 2 (6.7) | 35 (66.0) | 0 (0) |
| Valen | 66 (34.4) | 7 (10.6) | 25 (53.2) | 0 (0) |
| Opdal | 19 (13.9) | 1 (5.3) | 23 (63.9) | 0 (0) |
| Rosenberg | 45 (47.4) | 12 (26.7) | 3 (15.0) | 0 (0) |
| Møllendal | 19 (22.6) | 6 (31.6) | 10 (58.8) | 1 (10.0) |
Table 3
Share and relative odds of morbidity by patient status, age, sex, and institution.
| Covariates | N (%) Not Sick | N (%) Sick | Model 1 | Model 2 | Model 3 | Model 4 |
|---|---|---|---|---|---|---|
| OR (95% CI) | OR (95% CI) | OR (95% CI) | OR (95% CI) | |||
| Patients | 977 (76.2) | 305 (23.8) | 0.272 (0.212–0.350)* | 0.394 (0.301–0.516)* | 0.402 (0.307–0.527)* | 0.392 (0.298–0.516)* |
| Employees | 157(46.6) | 180 (53.4) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) |
| 10–19 | 24 (42.1) | 33 (57.9) | 1.00 (Ref) | 1.00 (Ref) | 1.00 (Ref) | |
| 20–29 | 192 (51.9) | 178 (48.1) | 0.735 (0.412–1.311) | 0.714 (0.399–1.277) | 0.620 (0.344–1.117) | |
| 30–39 | 312 (69.8) | 135 (30.2) | 0.429 (0.239–0.768)* | 0.415 (0.231–0.746)* | 0.371 (0.205–0.670)* | |
| 40–49 | 271 (79.9) | 68 (20.1) | 0.259 (0.141–0.477)* | 0.250 (0.135–0.461)* | 0.213 (0.115–0.397)* | |
| 50–59 | 196 (78.4) | 54 (21.6) | 0.297 (0.159–0.557)* | 0.285 (0.152–0.537)* | 0.242 (0.127–0.458)* | |
| 60–69 | 139 (89.1) | 17 (10.9) | 0.137 (0.065–0.290)* | 0.133 (0.063–0.281)* | 0.114 (0.053–2.43)* | |
| Males | 606 (72.0) | 236 (28.0) | 1.00 (Ref) | 1.00 (Ref) | ||
| Females | 528 (68.0) | 249 (32.0) | 1.182 (0.942–1.484) | 1.288 (1.015–1.634)* | ||
| Eg | 272 (73.9) | 96 (26.1) | 0.721 (0.512–1.017)+ | |||
| Neevengaarden | 249 (68.6) | 114 (31.4) | 1.00 (Ref) | |||
| Dale | 195 (75.0) | 65 (25.0) | 0.674 (0.460–0.989)* | |||
| Valen | 148 (61.9) | 91 (38.1) | 1.348 (0.934–1.945) | |||
| Opdal | 131 (75.7) | 42 (24.3) | 0.634 (0.407–0.986)* | |||
| Rosenberg | 67 (58.3) | 48 (41.7) | 1.966 (1.219–3.172)* | |||
| Møllendal | 72 (71.3) | 29 (28.7) | 0.944 (0.564–1.580) | |||
| N | 1619 | 1619 | 1619 | 1619 | ||
| –2 log likelihood | 1872.370 | 1800.254 | 1798.177 | 1766.024 | ||
| Nagelkerke R2 | .089 | .147 | .148 | .173 |
[i] * p < 0.05.
+ p < 0.10.
Table 4
Chi-square results testing association between patient status and case fatality.
| Comparisons | ILI Cases | ILI Deaths | ILI Survivors | Case Fatality (Deaths/Cases, %) | Chi-Square Results |
|---|---|---|---|---|---|
| Both Sexes | |||||
| Patients | 305 | 30 | 275 | 9.84 | X2 = 13.983 |
| Employees | 180 | 2 | 178 | 1.11 | P = 0.000 |
| Males | |||||
| Patients | 166 | 17 | 149 | 10.24 | X2 = 5.427 |
| Employees | 70 | 1 | 69 | 1.43 | P = 0.02 |
| Females | |||||
| Patients | 139 | 13 | 126 | 9.35 | X2 = 8.250 |
| Employees | 110 | 1 | 109 | 0.91 | P = 0.004 |