Table 3.

Pre-onset status of catching cold. (Survey response: a-1; Never caught cold. a-2; Sometimes caught cold but never had high fever or required bed rest. a-3; Sometimes had high fever and required bed rest.)

Survey response	PD group	Normal controls	CVD control
a-1	21(15.1%)	11(16.4%)	8(21.6%)
a-2	95(68.3%)	35(52.2%)	20(54.1%)
a-3	23(16.6%)	21(31.4%)	9(24.3%)
Total No. of persons	139	67	37