Variable breakdown

smoking_now

---

Section and category

Smoking.Basic

---

Description

“How often do you smoke tobacco now?”

---

Additional information

	Metadata
validation	Soft min: 1 if smoked today
contents	Categorised
is_mandatory	Yes

---

Data summary

Baseline

value	freq	pct_valid	pct_tot
Do not smoke now	363985	70.62	70.62
Only occasionally	22959	4.45	4.45
Yes, on most days	3810	0.74	0.74
Yes, daily or almost every day	124659	24.19	24.19
<NA>	0	NA	0.00

Qc

value	freq	pct_valid	pct_tot
Do not smoke now	11285	71.35	71.35
Only occasionally	677	4.28	4.28
Yes, on most days	125	0.79	0.79
Yes, daily or almost every day	3729	23.58	23.58
<NA>	0	NA	0.00

Resurvey 1

value	freq	pct_valid	pct_tot
Do not smoke now	14526	73.35	73.35
Only occasionally	770	3.89	3.89
Yes, on most days	114	0.58	0.58
Yes, daily or almost every day	4393	22.18	22.18
<NA>	0	NA	0.00

Resurvey 2

value	freq	pct_valid	pct_tot
Do not smoke now	19482	77.76	77.15
Only occasionally	711	2.84	2.82
Yes, on most days	150	0.60	0.59
Yes, daily or almost every day	4711	18.80	18.66
<NA>	198	NA	0.78

---

Between-survey agreement

Fleiss’ Kappa for m Raters:

N.participants	Surveys	Statistic	Coefficient	Z.statistic	p.value
483	4	Kappa	0.785	49.741	0

---

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