Table 1.
Characteristics of cases of influenza in Riyadh in 2009 included in the study
| Characteristic | H1N1 influenza | Seasonal influenza | Total | P |
|---|---|---|---|---|
| Age in years | ||||
| Mean | 22·8 | 31·9 | 27·8 | 0·000 |
| Standard deviation | 9·4 | 13·5 | 12·9 | |
| Sex | ||||
| Male | 39 (56·5) | 53 (58·2) | 92 (57·8) | 0·828 |
| Female | 30 (43·3) | 38 (41·8) | 68 (42·5) | |
| Nationality | ||||
| Saudi | 65 (94·2) | 61 (67·0) | 126 (78·8) | 0·000 |
| Non‐Saudi | 4 (5·8) | 30 (33·0) | 34 (21·2) | |
| Manifestations | ||||
| Running nose | 38 (55·1) | 73 (80·2) | 111 (69·4) | 0·0006 |
| Cough | 62 (89·9) | 73 (80·2) | 135 (84·4) | 0·097 |
| Fever | 51 (73·9) | 65 (71·4) | 116 (72·5) | 0·728 |
| Sore throat | 54 (78·3) | 71 (78·0) | 125 (78·1) | 0·971 |
| Shortness of breathing | 8 (11·6) | 20 (22·0) | 28 (17·5) | 0·088 |
| Difficulty in breathing | 5 (7·2) | 10 (11·0) | 15 (9·4) | 0·423 |
| Chest pain | 8 (11·6) | 12 (13·2) | 20 (12·5) | 0·763 |