Table 2.

Univariate analysis of variables determining selection of pacemaker in 21 858 patients^*

	Type of pacemaker (odds ratio (95% CI))
	Single chamber atrial	Single chamber ventricular	Dual chamber	Rate responsive
Age	0.84 (0.80 to 0.88)	1.35 (1.33 to 1.39)	0.75 (0.70 to 0.80)	0.80 (0.78 to 0.82)
Sex	0.84 (0.71 to 0.98)	0.76 (0.72 to 0.81)	1.38 (1.30 to 1.47)	1.38 (1.29 to 1.47)
Symptoms:
Syncope	1.04 (0.87 to 1.21)	1.15 (1.08 to 1.23)	0.85 (0.79 to 0.91)	0.65 (0.60 to 0.69)
Dizziness	1.64 (1.39 to 1.90)	0.78 (0.73 to 0.83)	1.20 (1.13 to 1.29)	1.19 (1.10 to 1.27)
Bradycardia	0.74 (0.58 to 0.91)	1.11 (1.03 to 1.20)	0.93 (0.85 to 1.01)	1.09 (1.00 to 1.18)
Heart failure	0.15 (0.07 to 0.25)	1.09 (0.95 to 1.23)	1.03 (0.90 to 1.18)	1.54 (1.35 to 1.75)
Electrocardiographic results:
Atrioventricular block	0.06 (0.04 to 0.09)†	0.35 (0.32 to 0.38)	3.85 (3.57 to 4.16)	0.93 (0.87 to 1.01)
Sick sinus syndrome	13.29 (11.11 to 15.42)	0.89 (0.84 to 0.94)	0.80 (0.75 to 0.85)	1.19 (1.12 to 1.27)
Atrial fibrillation/flutter	0.11 (0.07 to 0.17)†	14.28 (12.48 to 16.08)	0.06 (0.05 to 0.07)‡	1.01 (0.92 to 1.08)
Aetiology:
Ischaemic	0.71 (0.59 to 0.83)	1.43 (1.33 to 1.52)	0.71 (0.66 to 0.77)	0.68 (0.63 to 0.74)
Fibrosis	0.03 (0.02 to 0.04)	0.81 (0.73 to 0.90)	1.28 (1.15 to 1.43)	1.04 (0.93 to 1.16)
Carotid sinus syndrome	0.59 (0.35 to 0.88)	2.63 (2.13 to 3.17)	0.37 (0.30 to 0.45)	0.34 (0.27 to 0.43)

^*Categories used in logistic regression were age: older patients/younger patients (10 year intervals); sex: men/women; and symptoms, electrocardiography, and aetiology: yes/no.  

^†n<25.  

^‡n=119—cases with rare indications, low degree of disorder (atrioventricular block), or intermittent disorder.