Table 3
Consistency of Beliefs, Intention to Use and Actual Use of Birth Control Methods

Percentage Responding (a)
Belief of how a specific method acts
 Acts at Stage 2 (b)
 Does not act at Stage 2
Intention to use any method that acts at Stage 2 (b)
 No
Actual use of the specific method
 No
 Yes
Response Consistency
 Consistent (c)
 Inconsistent (d)
 Consistent (e)
Condoms
 1.0 (0.2,1.8)
 0.8 (0.1,1.5)
 14.6 (11.8,17.4)
Sterilization
 4.1 (2.5,5.7)
 0.3 (0.0,0.7)
 4.7 (3.0,6.4)
Oral Contraceptives
 8.3 (6.1,10.5)
 1.5 (0.5,2.5)
 16.2 (13.3,19.1)
Progestin-only pills
 7.3 (5.2,9.4)
 0.2 (0.0,0.6)
 2.4 (1.2,3.6)
Intrauterine Devices
 10.4 (8.0,12.8)
 0.0 (0.0,0.0)
 1.1 (0.3,1.9)
Depo-Provera
 4.4 (2.8,6.0)
 0.5 (0.0,1.1)
 1.8 (0.7,2.9)

Percentage Responding (a)
Belief of how a specific method acts
 Acts at Stage 3 (b)
 Does not act at Stage 3
Intention to use any method that acts at Stage 3 (b)
 No
Actual use of the specific method
 No
 Yes
Response Consistency
 Consistent (c)
 Inconsistent (d)
 Consistent (e)
Condoms
 0.5 (0.0,1.1)
 0.8 (0.1,1.5)
 23.0 (19.7,26.3)
Sterilization
 4.5 (2.9,6.1)
 0.2 (0.0,0.6)
 6.8 (4.8,8.8)
Oral Contraceptives
 1.9 (0.8,3.0)
 0.5 (0.0,1.1)
 27.4 (23.9,30.9)
Progestin-only pills
 1.5 (0.5,2.5)
 0.2 (0.0,0.6)
 4.4 (2.8,6.0)
Intrauterine Devices
 5.7 (3.9,7.5)
 0.0 (0.0,0.0)
 2.8 (1.5,4.1)
Depo-Provera
 1.6 (0.6,2.6)
 0.2 (0.0,0.6)
 4.4 (2.8,6.0)
(a) Percentages are of all respondents to questionnaire who gave the combined responses indicated in the particular column for each specific birth control method. Parentheses include 95% confidence interval limits.
(b) Stage 2 – After fertilization but before implantation; Stage 3 – After implantation in the uterus.
(c) This column includes respondents who gave the following internally consistent responses: they would not use a method that acted at Stage 2 or 3, believed that the specific method acted at Stage 2 or 3, and reported no actual use of the method.
(d) This column includes respondents who gave the following internally inconsistent responses: they would not use a method that acted at Stage 2 or 3, believed that the specific method acted at Stage 2 or 3, and reported actual use of the method.
(e) This column includes respondents who gave the following internally consistent responses: they would not use a method that acted at Stage 2 or 3, believed that the specific method did not act at Stage 2 or 3, and reported actual use of the method.