Occult AIDS: pneumocystis carinii pneumonia in elderly people.

4-9 years, indicating an even distribution of the patients. The standard deviation of the means ranged from 0-84 to l 25 kPa for arterial oxygen tension and from 0 7 to 2 1% for oxygen saturation. No clinically important differences were found for other variables (multiple analysis of variance for haemoglobin, packed cell volume, mean cell volume, arterial carbon dioxide tension, bicarbonate concentration, pH, and smoking habits (< 10 cigarettes/day)). There were no sex differences, except for persistently higher packed cell volumes in men.