Table 4.
Vaccine delivery outcomes
| Needle and syringe (n=917) | Disposable syringe jet injector (n=929) | Intradermal adapter (n=874) | ||
|---|---|---|---|---|
| Intradermal fluid bleb size, mm | 7 (5–8) | 3 (1–5) | 5 (4–7) | |
| Fluid loss onto skin* | ||||
| Dry | 317/880 (36·0%) | 288/864 (33·3%) | 546/849 (64·3%) | |
| <5 μL | 505/880 (57·4%) | 263/864 (30·4%) | 258/849 (30·4%) | |
| 5 to <10 μL | 25/880 (2·8%) | 76/864 (8·8%) | 26/849 (3·1%) | |
| 10 to <20 μL | 21/880 (2·4%) | 65/864 (7·5%) | 11/849 (1·3%) | |
| ≥20 μL | 12/880 (1·4%) | 172/864 (19·9%) | 8/849 (0·9%) | |
| Time taken to vaccinate | ||||
| <1 min | 300/917 (32·7%) | 507/929 (54·6%) | 294/874 (33·6%) | |
| 1 to <2 min | 592/917 (64·6%) | 409/929 (44·0%) | 553/874 (63·3%) | |
| 2 to <3 min | 23/917 (2·5%) | 11/929 (1·2%) | 24/874 (2·7%) | |
| ≥3 min | 2/917 (0·2%) | 2/929 (0·2%) | 3/874 (0·3%) | |
| Distress associated with injection | ||||
| Did not cry | 427/917 (46·6%) | 771/929 (83·0%) | 392/874 (44·9%) | |
| Cried briefly, consoled easily | 329/917 (35·9%) | 66/929 (7·1%) | 351/874 (40·2%) | |
| Crying for a long time | 35/917 (3·8%) | 12/929 (1·3%) | 23/874 (2·6%) | |
| Crying before injection | 126/917 (13·7%) | 80/929 (8·6%) | 108/874 (12·4%) | |
Data presented as median (IQR) or n/N (%).
*
Fluid loss was not collected on every participant because of the rate of vaccination.