Variable breakdown

smoking_age_start

---

Section and category

Smoking.Details

---

Description

“At about what age did you first start smoking on most days?”

---

Additional information

	Metadata
validation	Soft min: Male: 10; Female: 15, Hard max: Current age or Age stopped
contents	Age in years
is_mandatory	Yes

---

Data summary

Baseline

mean	sd	min	q1	med	q3	max	mad	iqr	cv	skewness	se.skewness	kurtosis	n.valid	pct.valid
22.74	7.46	2	18	20	25	76	4.45	7	0.33	1.85	0.01	5.03	166674	32.34

Resurvey 1

mean	sd	min	q1	med	q3	max	mad	iqr	cv	skewness	se.skewness	kurtosis	n.valid	pct.valid
22.8	7.63	5	18	20	25	73	4.45	7	0.33	1.98	0.03	5.71	6015	30.37

Resurvey 2

mean	sd	min	q1	med	q3	max	mad	iqr	cv	skewness	se.skewness	kurtosis	n.valid	pct.valid
22.75	8.14	4	18	20	25	79	5.93	7	0.36	1.84	0.03	5.28	6739	26.69

---

Between-survey agreement

[1] “ICC:”

## Error in loadNamespace(x): there is no package called 'psych'

---

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