Table 1.

Characteristics of men who participated versus those who dropped out of The Olmsted County Study of Urinary Symptoms and Health Status among Men, Rochester, Minnesota (1989–2003)

	Baseline Questionnaire†
	Participated		Dropped out‡
	No.	%	No.	%	Chi-sq p
AGE (years)
40–49	734	46.7	336	49.3	0.01
50–59	458	29.2	138	20.2
60–69	293	18.7	105	15.4
70+	85	5.4	103	15.1
AUASI*
≤ 7	1105	70.4	452	66.3	0.05
> 7	465	29.6	230	33.7
QMAX (mL/s)*
≥ 12	1297	82.8	532	78.2	0.01
< 12	269	17.2	148	21.8
PSA (ng/mL)*
≤ 1.4	329	75.3	107	70.9	0.28
> 1.4	108	24.7	44	29.1
VOL (cm3)*
≤ 30	300	68.8	94	62.7	0.17
> 30	136	31.2	56	37.3

* AUASI, American Urological Association Symptom Index; QMAX, peak urinary flow rate; PSA, Prostate-Specific Antigen; VOL, prostate volume.

† Age was calculated based on the age at baseline questionnaire completion.

‡ No questionnaire completed in seventh biennial contact year.

§ Men who died between contacts were excluded, n = 195.

¶ Of the 195 excluded men, 46 were men in the clinic subset.

# PSA and VOL measurements are from the randomly selected in-clinic subset, n = 588.