Section and category

Physical Exam.Lung function

Description

“Max FEV1 measurement (of the two taken)”

Additional information

	Metadata
contents	No. of litres (x100)
soft_min	40
soft_max	550
hard_min	10
hard_max	700
is_mandatory	No

Data summary

Baseline

mean	sd	min	q1	med	q3	max	mad	iqr	cv	skewness	se.skewness	kurtosis	n.valid	pct.valid
226.36	66.52	15	181	222	268	573	63.75	87	0.29	0.28	0	0.12	515413	100

Qc

mean	sd	min	q1	med	q3	max	mad	iqr	cv	skewness	se.skewness	kurtosis	n.valid	pct.valid
228	64.2	33	186	224	267	556	60.79	81	0.28	0.28	0.02	0.28	15816	100

Resurvey 1

mean	sd	min	q1	med	q3	max	mad	iqr	cv	skewness	se.skewness	kurtosis	n.valid	pct.valid
226.04	73.78	10	177	222	271	620	69.68	94	0.33	0.36	0.02	0.38	19481	98.37

Resurvey 2

mean	sd	min	q1	med	q3	max	mad	iqr	cv	skewness	se.skewness	kurtosis	n.valid	pct.valid
214.22	74.65	12	164	209	259	700	69.68	95	0.35	0.53	0.02	0.9	24300	96.23

Between-survey agreement

[1] “Spearman’s correlation matrix:”

	Baseline	Qc	Resurvey1	Resurvey2
Baseline	1.000	0.901	0.764	0.736
Qc	0.901	1.000	0.753	0.735
Resurvey1	0.764	0.753	1.000	0.720
Resurvey2	0.736	0.735	0.720	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

fev1_max_x100