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Variance in droplet production between participants when singing a note and ‘Happy Birthday’.
| Task | Condition | Between-participant variance* (× 10–3 scale) Estimate (95% CI) |
|---|---|---|
| Happy Birthday | No mask | 2.85 (1.31, 6.14) |
| Mask | 1.47 (0.68, 3.19) | |
| Note | No mask | 2.58 (0.83, 8.02) |
| Mask | 1.66 (0.53, 5.22) |
*Obtained from multilevel negative binomial regression analyses.
