Table 3. Multivariable model predicting use of prior intrauterine insemination in men presenting to a male fertility specialty clinic.

Predictor	Odds ratio (95% confidence interval)
Patient age (for each 1 year increase)	0.97 (0.95 to 0.99)
Partner age (for each 1 year increase)	1.07 (1.04 to 1.10)
Year of consultation (for each 1 year increase)	1.05 (1.01 to 1.09)
Infertility duration (for each 1 year increase)	1.00 (1.00 to 1.00)
Volume, mL
<1.5	Reference
≥1.5	1.21 (0.87 to 1.69)
Sperm concentration, million/mL
<15	Reference
≥15	1.33 (0.97 to 1.84)
Sperm count, million
<39	Reference
≥39	0.88 (0.64 to 1.21)
Total motility
<40%	Reference
≥40%	0.79 (0.44 to 1.42)
Progressive motility
<32%	Reference
≥32%	1.29 (0.66 to 2.51)
Normal forms
<4%	Reference
≥4%	0.83 (0.61 to 1.12)
Viability
<58%	Reference
≥58%	1.22 (0.92 to 1.62)