41. At least Adair knows what she has : summer SAD, also known as reverse seasonal affective disorder . 42. The letters stand for Pre-Seasonal Affective Disorder . 43. Perhaps 2 percent of the population suffers from what psychiatrists call seasonal affective disorder _ or winter blues. 44. HEALTH-THINGS _ Five things you should know about Seasonal Affective Disorder , or SAD . ( McKenna, Atlanta Journal-Constitution) 45. Hayes estimates 15 percent of the British population suffers from symptoms of winter depression, or Seasonal Affective Disorder . 46. The mGluR3 receptor encoded by the GRM3 gene has been found to be associated with bipolar affective disorder . 47. Many health-care workers who deal with borderlines feel their disorder combines the worst features of cognitive and affective disorders . 48. There are some people who truly have very severe seasonal affective disorder , and it is for them quite impairing, 49. One involves the relationship between depression and lower sunlight levels in winter, a condition known as seasonal affective disorder . 50. Seasonal Affective Disorder is a mood disorder marked by depression during a certain time of year _ especially winter.