Table 1. Descriptive statistics of 11127 study participants.

	NHS (7002 females)		HPFS (4125 males)
	Mean/Frequency	Standard Deviation/(%)	Mean/Frequency	Standard Deviation/(%)
Age at blood draw (yrs)	57.8	6.8	62.2	9.2
1st Measure of Phobic Anxiety*	2.8	2.2	1.9	1.9
2nd Measure of Phobic Anxiety**	2.8	2.4	1.9	1.9
Mean of 1st and 2nd Measurement of Phobic Anxiety	2.8	2.1	1.9	1.7
Ever Phobic Anxiety? (1st or 2nd Measurement ≥4)	2937	42.0	1068	25.9

^*Missing Information: NHS = 175, 5.1% of participants with item non-response, 0.1% with item non-response >2 out of 8 items; HPFS = 328, 1.1% of participants with item nonresponse, 0.1% with item non-response >2 out of 8 items.

^**Missing Information: NHS = 1093 (726 due to death) 4.1% of participants with item non-response, 0.2% with item non-response >2 out of 8 items; HPFS = 479 (294 due to death), 5.1% of participants with item non-response, 0.2% with item non-response >2 out of 8 items.