Table 4.

Tier 2—proportions of assignment regarding self-reported confidence in response about contraceptive stop and start dates, Cohen κ, and percent absolute agreement of interviewer-administered and self-administered among 19 female respondents with cystic fibrosis.^a

Self-administered	Interviewer-administered					Total
	Very uncertain	Somewhat uncertain	Somewhat certain	Very certain
Very uncertain	0	0	1	1	2
Somewhat uncertain	0	0	0	1	1
Somewhat certain	0	0	7	4	11
Very certain	0	0	1	4	5
Total	0	0	9	10	19

^aObserved agreement: 58%, =0.28, 95% CI −0.05 to 0.61.