A score of 1 indicates that the penis is larger than normal, but not hard;–> correlates with severe dysfunction (IIEF score 0-6)
A score of 2 indicates that the penis is hard, but not hard enough for penetration;–> correlates with moderate dysfunction (IIEF score 7-12)
A score of 3 indicates that the penis is hard enough for penetration but not completely hard; –> correlates with mild to moderate dysfunction (IIEF score 13-24)
A score of 4 indicates that the penis is completely hard and fully rigid; –> correlates with no dysfunction (IIEF score 25-30)