Essential Tremor Prevalence is Low in the Druze Population in Northern Israel

Judith Aharon-Peretz; Samih Badarny; Raphiq Ibrahim; Ruth Gershoni-Baruch; Gamal Hassoun

doi:10.5334/tohm.90

Figures & Tables

Table 1.

Stratification by Age: Target Population vs. Study Population

Participation Rate	Study Population		Target Population		Age Group
44%		3980		9086
42%	47.9%	1906	50.40%	4580	51–60
42%	26.6%	1059	27.70%	2519	61–70
52%	18.6%	739	15.80%	1432	71–80
51%	6.0%	238	5.10%	465	81–90
42%	1.0%	38	1.00%	90	90+

[i] Please note: the first two columns of percentages are column percentages (i.e. they are not row percentages). Participation rate was obtained by dividing the study population by the target population and then multiplied by 100.

Table 2.

Prevalence of Parkinson's Disease (PD), PD and Parkinsonism (PD+), Essential Tremor (ET) and Questionable Essential Tremor (ET+) in the Druze Population of the Galilee

	Number Screened	Number Diagnosed	Prevalence (%)	95% CI
PD+	3980	32	0.80	0.53	1.08
PD	3980	23	0.58	0.21	0.95
ET+	3980	36	0.90	0.61	1.20
ET	3980	27	0.68	–0.19	1.55

Table 3.

Stratification by Age. Parkinson's Disease (PD) and Parkinson's Disease and Parkinsonism (PD+), Essential Tremor (ET), and All Tremors (ET+)

Age Group (years)	Diagnosis	No. Screening	No. Patients	Prevalence (%)	95% CI
51–60	PD +	1906	4	0.21	0.00	0.42
	PD	1906	3	0.16	−0.02	0.34
61–70	PD +	1059	6	0.57	0.11	1.02
	PD	1059	4	0.38	0.01	0.75
71–80	PD +	739	11	1.49	0.62	2.36
	PD	739	9	1.22	0.43	2.01
81+	PD +	276	11	3.99	1.68	6.29
	PD	276	7	2.54	0.68	4.39
51–60	ET+	1906	2	0.10	−0.04	0.25
	ET	1906	1	0.05	−0.05	0.16
61–70	ET+	1059	9	0.85	0.30	1.40
	ET	1059	6	0.57	0.11	1.02
71–80	ET+	739	16	2.17	1.12	3.21
	ET	739	12	1.62	0.71	2.54
81+	ET+	276	9	3.26	1.17	5.36
	ET	276	8	2.90	0.92	4.88

Table 4.

Age and Gender as Risk Factor for Essential Tremor and Parkinson's Disease (logistic regression model)

Lower	Upper
Essential Tremor
Age	51–60			Ref
Age	61–70	2.387	0.027	10.878	1.308	90.483
71–80	3.449	0.001	31.482	4.086	242.556
80+	4.033	<0.001	56.408	7.025	452.919
			p trend<0.001
Sex	M vs. F	0.258	0.51	1.294	0.601	2.785
	Constant	−7.684
Parkinson's Disease
Age	51–60			Ref
Age	61–70	0.888	0.246	2.43	0.543	10.884
71–80	2.061	0.002	7.851	2.118	29.101
80+	2.767	<0.001	15.916	4.084	62.022
			p trend<0.001
Sex	M vs. F	1.083	0.023	2.952	1.158	7.527
	Constant	−7.114

[i] Abbreviations: M, male; F, female.