Table 1.
Characteristics of three measles groups in a modified measles-dominated outbreak, Yamagata Prefecture, Japan, March–April 2017
| Patient characteristic | Measles groups, no. (%) | P valueb | ||
|---|---|---|---|---|
| Modified measles (n = 35) | Prodromal stage of typical measlesa (n = 9) | Typical measles (n = 9) | ||
| Age (y), mean ± s.d. | 31.2 ± 8.7 | 38.9 ± 11.7 | 28.2 ± 14.8 | 0.08 |
| Male sex | 26 (74.3) | 6 (66.7) | 7 (77.8) | 0.90 |
| Clinical presentation | ||||
| Fever | 35 (100) | 9 (100) | 9 (100) | 1.00 |
| Catarrhal symptom | 6 (17.1) | 1 (11.1) | 9 (100) | <0.001 |
| Rash | 9 (25.7) | 4 (44.4) | 9 (100) | <0.001 |
| Vaccine status | ||||
| None | 4 (11.4) | 2 (22.2) | 4 (44.4) | |
| One dose | 22 (62.9) | 1 (11.1) | 2 (22.2) | |
| Two doses | 5 (14.3) | 0 (0) | 1 (11.1) | |
| Unknown | 4 (11.4) | 6 (66.7) | 2 (22.2) | 0.002 |
| Days after onset, mean ± s.d. | 1.4 ± 1.8 | 1.6 ± 1.4 | 3.7 ± 2.0c | 0.006 |
a
Patients diagnosed with modified measles at the point of sample collection, but who finally progressed to typical measles.
b
Result of one-way analysis of variance or Fisher's exact test.
c
Significantly longer than the groups of modified measles (P = 0.004) and prodromal stage of typical measles (P = 0.04) by Tukey–Kramer test.