Table 1.
Basic characteristics of participants.
| Booster group (n = 63) | Control group (n = 40) | P-value | |
|---|---|---|---|
| Age (years) | 28.0 (25.0–38.0) | 25.0 (24.0–27.8) | 0.002 |
| Sex | |||
| Male (%) | 27 (42.9%) | 16 (40.0%) | 0.774 |
| Female (%) | 36 (57.1%) | 24 (60.0%) | |
| Interval between the second and third doses | |||
| 4–6 months (%) | 29 (46.0%) | 27 (67.5%) | 0.033 |
| 7–8months (%) | 34 (54.0%) | 13 (32.5%) | |
| BMI | 22.2 (20.4-23.9) | 23.2 (20.7-25.4) | 0.400 |
| Ethnic group, Asian | 63 (100.0%) | 40 (100.0%) | – |
| Age groups | |||
| <40 years | 50/63 (79.4%) | 32/40 (80.0%) | 0.938 |
| Male (%) | 21/50 (42.0%) | 13/32 (40.6%) | 0.902 |
| Female (%) | 29/50 (58.0%) | 19/32 (59.4%) | |
| An interval of 4–6 months between the second and third doses | 26/50 (52.0%) | 26/32 (81.3%) | 0.007 |
| An interval of 7–8 months between the second and third doses | 24/50 (48.0%) | 6/32 (18.8%) | |
| BMI | 22.0 (20.4–23.8) | 22.4 (20.2–25.3) | 0.497 |
| ≥40 years | 13/63 (20.6%) | 8/40 (20.0%) | 0.938 |
| Male (%) | 6/13 (46.2%) | 3/8 (37.5%) | 0.999 |
| Female (%) | 7/13 (53.8%) | 5/8 (62.5%) | |
| An interval of 4–6 months between the second and third doses | 3/13 (23.1%) | 1/8 (12.5%) | 0.502 |
| An interval of 7–8 months between the second and third doses | 10/13 (76.9%) | 7/8 (87.5%) | |
| BMI | 22.9 (21.3–24.0) | 24.7 (23.5–27.9) | 0.080 |
Note: Date presented as Median (interquartile) or number (percentage).
For all categorical variables, the Chi-Square statistic was used.
Continuous variables were compared using a Mann–Whitney test.
P < 0.05 was considered statistically significant for all analyses. BMI = Body Mass Index.