Number and percentage (n/%) of participants from respective study arms reporting pain after Tdap injection
| Northern arm (N=326) | Canterbury arm (N=467) | Total (N=793) | |
|---|---|---|---|
| Pain | |||
| None | 56 (17.2) | 90 (19.3) | 146 (18.4) |
| Mild, still able to move arm normally | 163 (50.0) | 184 (39.4) | 347 (43.8) |
| Moderate, hurts to move or to touch | 90 (27.6) | 189 (40.5) | 279 (35.2) |
| Severe, unable to move arm | 17 (5.2) | 4 (0.9) | 21 (2.6) |
| Onset of pain (h) | (n=270) | (n=377) | (n=647) |
| 0–24 | 201 (74.4) | 342 (90.7) | 543 (83.9) |
| 25–48 | 68 (25.2) | 35 (9.3) | 103 (15.9) |
| 49–72 | 1 (0.4) | – | 1 (0.2) |
| Pain resolved by (h) | |||
| 0–24 | 30 (11.1) | 131 (34.7) | 161 (25.1) |
| 25–48 | 86 (31.9) | 141 (37.4) | 227 (35.4) |
| >49 | 154 (57.0) | 99 (26.3) | 253 (39.5) |
| Missing | – | 6 (1.6) | 6 (0.9) |