Sentence:  Assuming a normal approximation to <WSD>binomial</WSD> probabilities the proportion of total complications reported for 1979–85 in the age class 0–14 years was significantly higher than the proportion in the same age class for the period 1962–69 (p < 0·0001) 
Meaning of the word marked with <WSD> tags:  Of or relating to the binomial distribution.