Section and category

Reproductive History.Contraceptive use

Description

“For how long altogether have you used oral contraceptives?”

Additional information

	Metadata
validation	Hard max: 70 or (Current age - pill_first_use_age + 1) or (Pill_stopped_age - Pill_first_use_age + 2)
contents	No. of years
soft_min	1
soft_max	20
hard_min	0
is_mandatory	No

Data summary

Baseline

mean	sd	min	q1	med	q3	max	mad	iqr	cv	skewness	se.skewness	kurtosis	n.valid	pct.valid
3.61	4.33	0	1	2	4	35	1.48	3	1.2	2.38	0.01	5.93	29880	5.8

Resurvey 1

mean	sd	min	q1	med	q3	max	mad	iqr	cv	skewness	se.skewness	kurtosis	n.valid	pct.valid
3.46	4.12	0	1	2	4	25	1.48	3	1.19	2.4	0.07	5.98	1069	5.4

Resurvey 2

mean	sd	min	q1	med	q3	max	mad	iqr	cv	skewness	se.skewness	kurtosis	n.valid	pct.valid
3.69	4.51	0	1	2	5	30	1.48	4	1.22	2.35	0.07	5.87	1391	5.51

Between-survey agreement

[1] “Spearman’s correlation matrix:”

	Baseline	Resurvey1	Resurvey2
Baseline	1.000	0.693	0.601
Resurvey1	0.693	1.000	0.592
Resurvey2	0.601	0.592	1.000

International Coordinating Centre, China Kadoorie Biobank (CKB), CTSU, Nuffield Department of Population Health, University of Oxford Old Road Campus, Headington, Oxford, OX3 7LF

Tel: +44 (0)1865 743743 | Fax: +44 (0)1865 743985 | Email: ckbaccess@ndph.ox.ac.uk

Copyright China Kadoorie Biobank (CKB), University of Oxford, (2024)

Page generated: 27-02-2024

Variable breakdown

pill_use_years