| Adjusted incidence rate ratio (95 % CI) | |||||
---|---|---|---|---|---|---|
 | < 1 year of age | ≥ 1 year of age | ||||
 | Physician visits | ED visits | Hospitalizations | Physician visits | ED visits | Hospitalizations |
False Positive | 1.45 (1.23–1.72) | 0.81 (0.52–1.27) | 2.20 (1.45–3.22) | 1.00 (0.80–1.26) | 0.81 (0.53–1.27) | 0.60 (0.22–1.28) |
Season of birth | Â | Â | Â | Â | Â | Â |
 Jan.–Apr. | Reference | Reference | Reference | Reference | Reference | Reference |
 May–Aug. | 1.03 (0.94–1.13) | 1.07 (0.86–1.32) | 0.73 (0.53–1.02) | 0.97 (0.86–1.09) | 1.07 (0.87–1.33) | 1.67 (1.20–2.34) |
 Sept.–Dec. | 1.04 (0.95–1.13) | 1.13 (0.91–1.41) | 1.03 (0.77–1.39) | 1.04 (0.92–1.16) | 1.11 (0.90–1.38) | 1.29 (0.90–1.86) |
Birth weight | Â | Â | Â | Â | Â | Â |
  < 2500 g | 1.64 (1.38–1.96) | 1.26 (0.85–1.90) | 1.46 (0.96–2.21) | 1.18 (0.95–1.49) | 1.27 (0.86–1.91) | 1.60 (1.00–2.52) |
  ≥ 2500 g | Reference | Reference | Reference | Reference | Reference | Reference |
Gestational age | Â | Â | Â | Â | Â | Â |
  < 37 weeks | 1.72 (1.46–2.02) | 1.12 (0.77–1.65) | 3.07 (2.08–4.43) | 1.21 (0.99–1.50) | 1.13 (0.78–1.65) | 2.18 (1.38–3.34) |
  ≥ 37 weeks | Reference | Reference | Reference | Reference | Reference | Reference |