Table 1.
Study results.
|
Index Cases
N = 195 |
AR
<0.5 |
AR
≥0.5 |
Chi-Square/Fisher’s Exact Test (df = 1) | Significance | |
|---|---|---|---|---|---|
| Females , n (%) | 94 (51.4) | 43 45.7) | 51 (54.3) | 1.4 | p = 0.1 |
| Pregnant , n (%) | 23 (11.8) | 13 (60) | 9 (40) | 3.21 | p = 0.2 |
| Disabled , n (%) | 10 (5.1) | 1 (12.5) | 7 (87.5) | 3 | p = 0.2 |
| SARS-CoV-2 vaccination , n (%) | 3.83 | p = 0.1 | |||
| Vaccination | 31 (17) | 8 (25.8) | 23 (74.2) | ||
| No vaccination | 150 (82) | 67 (44.7) | 83 (55.3) | ||
| Self-isolation , n (%) | 143 (73.3) | 53 (40) | 80 (60) | 0.68 | p = 0.7 |
| Hospital admission , n (%) | 125 (64.1) | 51 (42) | 70 (53) | 0.73 | p = 0.7 |
| Deaths , n (%) | 0 (0) | 0 (0) | 0 (0) | 1 | p = 1 |
| Age , years, median (IQR) | 49 (34–62) | 39 (29-61) | 52 (35–62) | p = 0.02 | |
| Charlson Index , median (IQR) | 0 (0–2) | 0 (0–2) | 1 (1) | p = 0.02 | |
| House dimension , square feet, median (IQR) | 100 (80–120) | 100 (80–130) | 100 (80–110) | p = 0.1 | |
| Number of rooms , median (IQR) | 3 (2–4) | 3 (2–4) | 3 (2.25–4) | p = 0.1 | |
| Number of bathrooms , median (IQR) | 2 (1–2) | 2 (1–2) | 2 (1–2) | p = 0.6 | |
| Number of disabled inhabitants , median (IQR) | 0 (0–1) | 1 (0–1) | 1 (0–1) | p = 0.4 | |
| Number of families per household , median (IQR) | 1 (1) | 1 (1–2) | 1 (1) | p = 0.02 | |
| House property | 5.83 | p = 0.01 | |||
| Owned, n (%) | 128 (65.5) | 60 (35) | 63 (36) | ||
| On rent, n (%) | 53 (27.2) | 14 (8) | 35 (20) | ||
| House position | |||||
| City of Naples | 20 (26) | 7 (37) | 13 (63) | 0.6 | p = 0.5 |
| • District 24—Chiaia, Posillipo, S. Ferdinando, isola di Capri | 3 (1.5) | 2 (7.1) | 1 (3.6) | 0.6, | p = 0.4 |
| • District 25—Bagnoli, Fuorigrotta | 3 (1.5) | 0 (0) | 3 (10.7) | 3 | p = 0.1 |
| • District 26—Pianura, Soccavo | 5 (2.6) | 2 (7.1) | 3 (10.7) | 0.1 | p = 0.6 |
| • District 27—Arenella Vomero | 6 (3.1) | 3 (10.7) | 2 (7.1) | 0.45 | p = 0.4 |
| • District 28—Chiaiano, Piscinola, Marianella, Scampia | 2 (1) | 1 (3.6) | 0 (0) | 1.2 | p = 0.5 |
| • District 29—Colli Aminei, San Carlo all’Arena, Stella | 1 (0.5) | 0 (0) | 1 (3.6) | 0.9 | p = 0.5 |
| • District 30—Miano, Secondigliano, S. Pietro a Patierno | 3 (1.5) | 2 (7.1) | 1 (3.6) | 0.5 | p = 0.4 |
| • District 31—Avvocata, Montecalvario, Pendino, Mercato, Porto | 2 (1) | 1 (3.6) | 1 (3.6) | 0.01 | p = 0.7 |
| • District 32—Barra, S. Giovanni, Ponticelli, Insediamento 167 | 5 (2.6) | 2 (7.1) | 3 (10.7) | 0.1 | p = 0.6 |
| • District 33—Vicaria, S. Lorenzo, Poggioreale | 0 (0) | 0 (0) | 0 (0) | ||
| Naples’ suburbs | 140 (71) | 52 (37) | 88 (63) | 5.3 | p = 0.02 |
| Caserta area | 21 (11) | 13 (62) | 8 (38) | 4 | p = 0.04 |
| Benevento area | 6 (3.4) | 3 (50) | 3 (50) | 0.18 | p = 0.5 |
| Salerno area | 8 (4.5) | 5 (62.5) | 3 (37.5) | 1.5 | p = 0.2 |
| Level of education of the HOH | |||||
| Elementary school, n (%) | 14 (7.7) | 9 (64.3) | 5 (35) | 3 | p = 0.8 |
| Middle school, n (%) | 50 (27.5) | 21 (42) | 29 (58) | 0.1 | p = 0.52 |
| High school, n (%) | 66 (36.3) | 27 (43) | 36 (57) | 0.002 | p = 0.5 |
| University degree, n (%) | 52 (28) | 18 (36.7) | 31 (63.3) | 0.9 | p = 0.2 |
| Employment of the HOH | |||||
| Permanent job, n (%) | 57 (32) | 20 (36.4) | 35 (63.6) | 1.25 | p = 0.2 |
| Temporary work, n (%) | 17 (9.6) | 8 (50) | 8 (50) | 0.4 | p = 0.3 |
| Self-employment, n (%) | 36 (20) | 17 (47.2) | 19 (52.8) | 0.5 | p = 0.3 |
| Unemployed, n (%) | 23 (13) | 12 (52.2) | 11 (47.8) | 1 | p = 0.2 |
| Retired, n (%) | 41 (23) | 13 (33.3) | 26 (66.7) | 1.6 | p = 0.1 |
| Annual income of the HOH, EUR | |||||
| <15.000, n (%) | 48 (41) | 20 (47.7) | 28 (58.3) | 0.13 | p = 0.4 |
| 15.001–28.000, n (%) | 41 (35) | 15 (40.5) | 22 (59.5) | 0.2 | p = 0.4 |
| 28.001–55.000, n (%) | 17 (15) | 9 (52.9) | 8 (47.1) | 0.7 | p = 0.3 |
| 55.001–75.000, n (%) | 5 (4.3) | 4 (80) | 1 (20) | 2.8 | p = 0.1 |
| >75.000, n (%) | 4 (3.5) | 0 (0) | 3 (100) | 2.4 | p = 0.2 |
AR, attack rate (the number of new cases of SARS-CoV-2 infection in each household divided for the number of subject living within the same household in the time interval of two weeks); HOH, head of the household; IQR, interquartile range.