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Table 1 Operationalization of the study variables and their categorization for analyses

From: Detection of xerostomia, Sicca, and Sjogren’s syndromes in a national sample of adults

Variables O Original measurement
( (codes)
Bivariate analyses
(codes)
Multivariate analyses
(codes)
Study Outcomes: Xerostomia Self-reported mouth dryness:
'1' never,
'2' sometimes,
'3' often,
'4' always
'1' never/sometimes,
'2' often/always
'1' control group,
'2' xerostomia group
Sicca syndrome '1' Sicca syndrome
'2' Non-Sicca syndrome
'1' Objective symptoms of Sicca syndrome
'2' No objective symptoms of Sicca syndrome
 
Indicators:   
Gender 1) males, 2) females '1' males, '2' females '1' males, '2' females
Age In full years '1′ 35–46 years, '2′ 47–60 yrs.; '3′ 61–74 yrs '1′ 35–60 yrs.;
'2′ 61–74 yrs
Residence Location of residence:
'1' urban;
'2' peri-urban;
'3' rural
‘1’ urban; ‘2’ peri-urban; ‘3’ rural '1' urban;
'2' peri-urban/rural
Education In full years '1' ≤ secondary; '2' college; '3' university +  '1' secondary or less;
'2' college/university or more
Systemic diseases
(Total number)
Any systemic condition '1' none; '2' one, '3' two or more conditions '1' none;
'2' one or more
Medications
(Total number)
Any medication '1' none; '2' one, '3' two or more '1' none;
'2' one or more
Perceived stress Total stress score (%) 10 questions (responses: '0' never; '1' rarely; '2' sometimes; '3' often; '4' very often. calculated from responses 3 and 4 and adjusted for the number of answers '1' low; '2' medium, '3' high/very high '1' low;
'2' medium/high/very high
Body Mass Index (BMI) Based on weight & height
(BMI = kg/m2)
'1' BMI ≤ 25.0; '2' BMI 25.1–29.9; '3' BMI ≥ 30 '1' underweight/normal;
'2' overweight/obese
Smoking '1' no; '2' yes '1' no; '2' yes '1' no
'2' yes;
Daily alcohol use in units1 Alcohol consumed in the past month: '0' none; '1' one unit; '2' two units, '3' units; '4' units; '5' five or more '1' no; '2' yes '1' no;
'2' yes
  1. 1One unit of alcohol: one beer or glass of wine or a small goblet of heavy liquor