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Table 3 Associations between pollen exposures and risk of hospital admission for asthma by 12-months

From: Pollen exposure in pregnancy and infancy and risk of asthma hospitalisation - a register based cohort study

  Crude OR Mutually adjusted Model 1* Model 2† Model 3‡
Effect per inter-quartile** range increase in pollen exposure    
First trimester 1.03 (0.98-1.09) 1.01 (0.95-1.07) 0.96 (0.88-1.05) 0.98 (0.89-1.08) 0.96 (0.88-1.05)
Last trimester 1.01 (0.93-1.09) 0.98 (0.90-1.08) 1.12 (0.97-1.29) 1.18 (1.00-1.38) 1.14 (0.98-1.33)
Infancy 0.82 (0.74-0.90) 0.82 (0.74-0.90) 0.84 (0.70-0.99) 0.80 (0.65-0.97) 0.84 (0.70-1.01)
Highest 25% of children exposed versus remain children    
First trimester 1.05 (0.91-1.22) 0.97 (0.82-1.14) 0.88 (0.70-1.11) 0.87 (0.67-1.12) 0.86 (0.68-1.09)
Last trimester 1.07 (0.92-1.24) 0.96 (0.81-1.14) 1.34 (1.06-1.69) 1.44 (1.11-1.86) 1.35 (1.07-1.71)
Infancy 0.72 (0.61-0.84) 0.70 (0.59-0.84) 0.75 (0.58-0.97) 0.77 (0.58-1.01) 0.76 (0.59-0.98)
  1. * Model 1. Adjusted for year and season of birth, maternal smoking, infant gender and gestational age.
  2. ** Effect per inter-quartile range increase specific for period (first = 93, and last trimester = 124, and infancy = 146 grains/day/ m3 of air).
  3. Model 2. As per model 1, and also adjusted for averaged concentration levels of airborne pollutants (O3 & NO2) during the first and third trimester and during the first three months of infancy.
  4. Model 3. As per model 1, and also adjusted for rates of hospitalisations for lower respiratory tract infections in first three months, and from three to six months of life.