Objective: To determine knowledge about domestic violence (DV), the ef
fectiveness of formal instruction about DV, and the prevalence of DV i
n a first-year medical school class. Methods: A general-knowledge surv
ey of DV was given before and approximately 1 month after 3 hours of i
nstruction provided by emergency medicine and internal medicine facult
y. A previously validated scale, the Index of Spouse Abuse (ISA), was
offered to determine baseline levels of DV within the group. Differenc
es in first-year medical student knowledge of facts about DV and diffe
rences in responses by men vs women were determined before and after t
he instruction.Results: In the pre-instruction series, 144 of 148 (97%
) participated, After the instruction, 141 of the same 148 students pa
rticipated (95%). The prevalence of DV against women was correctly ide
ntified by 45% of the students as ''15-30%'' prior to instruction, and
65% after instruction. The prevalence of DV against males was correct
ly identified as ''0-15%'' by 48% of the students prior to instruction
, and 70% after instruction. Before instruction, 29% of the students k
new that ''DV rates are equal in different socioeconomic groups,'' vs
72% after instruction. Similarly, prior to instruction 58% of the stud
ents knew that the victim is not responsible for the abuse, and 84% kn
ew this after instruction. Before instruction 14 (10%) of the students
believed they were victims of DV in the past, representing 7% of the
men and 13% of the women. Before instruction neither group believed th
ey were present victims of DV. However, according to ISA scoring, 6% o
f the women were positive for violence in the past, and approximately
5% were positive for present violence. No men were positive for ISA-de
termined past or present violence. Conclusion: Improvement in awarenes
s was demonstrated after 3 hours of instruction in a first-year medica
l school class. There was DV among female medical students in this fir
st-year class and self-reporting was not reliable. These results suppo
rt instruction on DV for medical students.