Abortion rates also vary depending on the stage of pregnancy and the method practiced. In 2003, the Centers for Disease Control and Prevention (CDC) reported that 26% of reported legal induced abortions in the United States were known to have been obtained at less than 6 weeks gestation, 18% at 7 weeks, 15% at 8 weeks, 18% at 9 through 10 weeks, 9.7% at 11 through 12 weeks, 6.2% at 13 through 15 weeks, 4.1% at 16 through 20 weeks and 1.4% at more than 21 weeks. 90.9% of these were classified as having been done by "curettage" (Suction-aspiration abortion, dilation and curettage, dilation and evacuation), 7.7% by "medical abortion" means (mifepristone), 0.4% by "instillation abortion" (saline or prostaglandin), and 1.0% by "other" (including hysterotomy abortion and hysterectomy). According to the CDC, due to data collection difficulties the data must be viewed as tentative and some fetal deaths reported beyond 20 weeks may be natural deaths erroneously classified as abortions if the removal of the dead fetus is accomplished by the same procedure as an induced abortion.

Question: What weeks have the lowest percentage of abortions?
Answer: more than 21 weeks

Question: What weeks have the highest percentage of abortions?
Answer: less than 6 weeks

Question: Which weeks have between 5% and 10% of abortions?
Answer: 11 through 12 weeks, 13 through 15 weeks

Question: What procedure represents the most legal induced abortions?
Answer: curettage

Question: How many fewer abortions, by percent, are performed during week 7 than in week 6?
Answer: 8

Question: At what ages were the least amount of abortions obtained?
Answer: more than 21 weeks

Question: Which method was most commonly used for abortions?
Answer: curettage

Question: Which method of abortion was the least commonly used?
Answer: instillation abortion

Question: Which ages saw less than 5% of the total abortions?
Answer: 16 through 20 weeks, more than 21 weeks

Question: By how many percent does the prevalence of abortions at 10 and 11 weeks differ?
Answer: 8.3

Question: Between which two age groups is the largest variance in abortions?
Answer: 9 through 10 weeks, 1 through 12 weeks

Question: How many percent of abortions are performed by hysterectomy?
Answer: 1

Question: Which gestation week were there more reported legal induced abortions in the United States, 7 weeks or 8 weeks?
Answer: 8 weeks

Question: How many more reported legal inducted abortions were there in the United States in 2003 at 9 through 10 weeks gestation compared to 11 through 12 weeks?
Answer: 8.3

Question: What are the four different classifications of abortion?
Answer: curettage, medical abortion, instillation abortion, other

Question: Which were there more abortions reported by the CDC in 2003, those at 7 weeks gestation or those at 8 weeks gestation?
Answer: at 7 weeks

Question: How many more abortions were performed, by percent, in 2003 at 9 through 10 weeks compared to those at 11 through 12 weeks?
Answer: 8.3

Question: Were more abortions done by curettage or by medical abortion?
Answer: curettage

Question: How many more abortions were done by medical abortion compared to those classified by instillation abortion?
Answer: medical abortion

Question: What is used for an instillation abortion?
Answer: saline, or prostaglandin

Question: How many abortions, by percent, occurred after 6 weeks gestation as reported by the CDC in 2003?
Answer: 74