There were 23 episodes in season two when the final episode, No Reason, is excluded. The breakdown for the season is:

Patients treated: 25
Lives saved: 19
Sex Kills counted as two patients because the team diagnosed a dead woman to save their actual patient. Euphoria and Forever also counted as two patients each, even though I didn't include the baby's treatment in my analysis of Forever.
The deaths occurred in Daddy's Boy, The Mistake, Euphoria, and Forever. For Daddy's Boy, The Mistake and Forever the patients were diagnosed but could not be cured. The cop in Euphoria died before he was diagnosed.

House: 39 diagnoses + 32 credits - 4 errors = 67 total
Chase: 3 diagnoses + 14 credits - 1 error = 16 total
Cameron: 4 diagnoses + 8 credits - 1 error = 11 total
Foreman: 2 diagnoses + 10 credits - 2 errors = 10 total

My conclusions: Chase and Cameron improved this season over last, while Foreman did not. Again Chase shows that he contributes more to others' diagnoses than by coming up with his own. I would argue that Cameron and Foreman are equal overall, but it's possible that Chase outperformed them.

Labels: Season 2, Summary