Indicate the presence of numerical data in the abstract (whether numerical data plays a key role in medical records), solely using the information from the abstract.

Abstract: Eighty-four patients with haematuria were seen during 1976 and 1977. This symptom was investigated but no definite cause could be found. Five or more years later they were followed up. Although some patients had experienced further urological symptoms, none was found to have developed a malignancy in the genito-urinary tract. Possible causes of their bleeding are discussed. 
Question: Does the abstract contain any numerical data?
Yes