The following table was presented in an article summarizing a study to compare a new drug to a standard drug and to a placebo.
| Characteristic |
New Drug |
Standard Drug |
Placebo |
p |
| Age, years |
45.2 (4.8) |
44.9 (5.1) |
42.8 (4.3) |
0.5746 |
| % Female |
51% |
55% |
57% |
0.1635 |
| Annual income, $000s |
59.5 (14.3) |
63.8 (16.9) |
58.2 (13.6) |
0.4635 |
| % with insurance |
87% |
65% |
82% |
0.0352 |
| Disease stage |
|
|
|
0.0261 |
| Stage I |
35% |
18% |
33% |
|
| Stage II |
42% |
37% |
47% |
|
| Stage III |
23% |
51% |
20% |
|
Which, if any, baseline characteristics are significantly different (at least 0.05 level of significance) between treatment groups?
a. Disease stage
b. Annual Income
c. % with insurance
d. age
e. a and c
f.b and d Statistics and Probabilitya