Table 1. Summary statistics by response group.
| Variable | Responder |
Non-responder |
Mann-Whitney U-test | ||
|---|---|---|---|---|---|
| N (%) | Median (IQR) | N (%) | Median (IQR) | ||
| Age (years) | 98 (80) | 24 (20-29) | 25 (20) | 26 (22-34) | p=0.15 |
| BMI (kg/m2) | 98 (80) | 28.40 (24.22-33.06) | 24 (20) | 32.66 (27.39-40.26) | p=0.009* |
| BMI Categories | P=0.035*$ | ||||
| • Underweight (<18.5 ) | 3 (75) | 18.29 (16.81-18,37) | 1 (25) | 17.22 (N/A) | P=0.65 |
| • Normal (18.5-24.9) | 25 (96) | 21.83 (21.26-23.37) | 1 (4) | 22.66 (N/A) | P=0.79 |
| • Overweight (25-29.9) | 30 (81) | 27.73 (26.49-28.83) | 7 (19) | 27.30 (26.89-28.25) | P=0.76 |
| • Obese (>30) | 40 (73) | 33.98 (31.64-38.19) | 15 (27) | 38.01 (33.31-45.09) | P=0.059 |
| Days post vaccination | 98 (80) | 41 (33-62) | 25 (20) | 37 (34-66) | p=0.77 |
| HBsAb titre (GMT / 95%CI) | 98 (80) | 72.61 (57.71-91.37) | |||
| Contraception | 98 (80) | 25 (20) | |||
| • None/non-hormonal | 31 (89) | 4 (11) | |||
| • Oral combined pill | 5 (83) | 1 (17) | P=0.24$ | ||
| • Long-acting injectable | 61 (75) | 20 (25) | |||
Data are presented as N (number of participants with each predictor variable in the respective response groups) and percentage of total with that predictor. BMI (Body Mass Index); HBsAb (Hepatitis B surface antibody); GMT (Geometric mean titre). IQR (Interquartile Range). * Illustrates p-value≤ 0.05. $ Fisher’s exact test p-value. [Underweight category not included in calculation of Fisher’s exact test p-value due to the small sample size (n=4)].