Table 4b:

Pooled multiple logistic regression model of socio-demographic, geographical and behavioural factors associated with ≥2 chronic conditions (multimorbidity) in women newly diagnosed with breast cancer.

Characteristics	Model 1 (Socio-demographic factors) OR (95% CI)	Model 2 (Socio-demographic and geographical factors) OR (95% CI)	Model 3 (Socio-demographic, geographical and behavioural factors) OR (95% CI)
Age in years	1.02 (1.01–1.03)b	1.02 (1.01–1.03)b	1.02 (1.01–1.03)b
Ethnicity
Black	1.00 (Ref)	1.00 (Ref)	1.00 (Ref)
Asian	1.05 (0.79–1.38)	0.70 (0.50–0.97)a	0.70 (0.50–0.97)a
Mixed	0.99 (0.66–1.50)	0.93 (0.61–1.40)	0.97 (0.63–1.49)
White	0.39 (0.27–0.58)b	0.34 (0.23–0.51)b	0.36 (0.24–0.54)b
Marital status
Married/co-habiting	1.00 (Ref)	1.00 (Ref)	1.00 (Ref)
Unmarried	1.09 (0.90–1.30)	1.06 (0.89–1.28)	1.07 (0.89–1.29)
Highest level of education
Primary education and below	1.00 (Ref)	1.00 (Ref)	1.00 (Ref)
Secondary education and above	1.04 (0.84–1.29)	1.08 (0.87–1.35)	1.08 (0.87–1.35)
Employment status
Unemployed	1.00 (Ref)	1.00 (Ref)	1.00 (Ref)
Employed	0.93 (0.75–1.14)	0.93 (0.75–1.15)	0.93 (0.75–1.15)
Household socio-economic status (score 0–6)	1.01 (0.96–1.07)	1.06 (0.99–1.13)	1.06 (1.00–1.13)b
Hospital site
Soweto, Johannesburg		1.00 (Ref)	1.00 (Ref)
Central Johannesburg		1.03 (0.81–1.31)	1.02 (0.80–1.30)
KZN Durban		1.90 (1.43–2.53)b	1.89 (1.42–2.51)b
KZN Pietermaritzburg		1.49 (1.13–1.98)a	1.49 (1.12–1.97)a
KZN rural		1.57 (0.94–2.63)	1.54 (0.92–2.57)
Residential distance from hospital site (km)		1.00 (0.99–1.00)	1.00 (0.99–1.00)
Have you ever consumed alcohol?
No			1.00 (Ref)
Yes			0.85 (0.67–1.07)
Have you ever smoked?
No			1.00 (Ref)
Yes			0.96 (0.71–1.29)
R2	0.028	0.031	0.033

OR (Odds ratio) = odds of reporting ≥2 chronic conditions compared with <2 chronic conditions

^aSignificant at p<0.05,

^bSignificant at p<0.001 KZN (KwaZulu-Natal)