Skip to main content

Table 1 Definitions of variables used

From: Prospective associations between pulse pressure and cognitive performance in Chinese middle-aged and older population across a 5-year study period

Baseline characteristics Wave Definitions
  Wave 1 (2011–2012)  
Time-invariant
 Age   Continuous
 Sex   Male = 1, female = 2
 BMI   Continuous
 Education level   11 Categories: “Illiterate,” “Did not finish primary school but capable of reading and/or writing,” “Home school,” “Elementary school,” “Middle school,” “High school,” “Vocational school,” and four higher levels
 Marital status   Living with spouse present = 1, married but not living with spouse temporarily for reasons such as work = 2, separated = 3, divorced = 4, widowed = 5, never married = 6
 Smoking   Yes = 1, no = 2
 Hukou status   Agricultural = 1, nonagricultural = 2
 Alcohol use   Drink more than once per month = 1, drink less than once per month = 2, none of these = 3
 Living status before age 16   Village = 1, city/town = 2
 Health status before age 16   Excellent = 1, very good = 2, good = 3, fair = 4, poor = 5
 Hypertension   Yes = 1, no = 2
 Diabetes or high blood sugar   Yes = 1, no = 2
 Psychiatric problems   Yes = 1, no = 2
 Memory-related disease   Yes = 1, no = 2
 Stroke   Yes = 1, no = 2
 Glucose   Continuous
 Glycosylated hemoglobin   Continuous
 Total cholesterol   Continuous
Time-variant Waves 1–3 (2011–2016)  
 Cognitive performance scores Continuous variable ranging from 0 to 21
 Pulse pressure   Continuous
 Systolic blood pressure   Continuous
 Diastolic blood pressure   Continuous
 ADL   Continuous variable ranging from 0 to 11
 Depression   Continuous variable ranging from 0 to 30
  1. BMI Body mass index, Hukou is the registration system in China created in 1955 to restrict internal population movement, especially rural-to-urban migration, divided Chinese into two categories: agricultural hukou (rural hukou) and non‐agricultural hukou (urban hukou)