Serum Hib antibody concentrations and proportions with concentrations <0.15 μg/ml and 1.0 μg/ml, by age, for premature infants and term infants
| Median age (months) | Premature GMT μg/ml (95% CI) (number) | Term GMT μg/ml (95% CI) (number) | Premature % <0.15 μμg/ml (number) | Term % <0.15 μg/ml (number) | Premature % <1.0 μg/ml (number) | Term % <1.0 μg/ml (number) | Proportions <0.15 μg/ml Ratio prem:term | Proportions <1.0 μg/ml Ratio: prem:term |
|---|---|---|---|---|---|---|---|---|
| *p<0.05 versus term infants at same age; †p=0.08 versus term infants at 5 months of age, ‡p<0.05 versus term infants at 72 months of age. | ||||||||
| 2 | 0.21* (0.16 to 0.27) (40) | 0.37 (0.31 to 0.44) (90) | 35* (40) | 10 (90) | 95 (40) | 89 (90) | 3.5 | 1.1 |
| 5 | 2.73† (1.63 to 4.58) (40) | 4.60 (3.51 to 6.04) (105) | 5 (40) | 1 (105) | 33* (40) | 12 (105) | 5.3 | 2.6 |
| 12 | 0.34* (0.20 to 0.56) (26) | 0.88 (0.66 to 1.17) (95) | 23* (26) | 6 (95) | 77 (26) | 57 (95) | 3.7 | 1.4 |
| 64 | 0.24‡ (0.16 to 0.37) (27) | 41 (27) | 81 (27) | |||||
| 72 | 0.51 (0.31 to 0.85) (59) | 32 (59) | 71 (59) | 1.3 | 1.1 | |||