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Table 1 Missingness and summary statistics for patient demographic informationa

From: A data quality assessment to inform hypertension surveillance using primary care electronic medical record data from Alberta, Canada

Data element

Summary

Males

N = 23,486 (48.5%)

Females

N = 24,889 (51.5%)

Year of birth

No. patients missing, n (%)

0 (0)

0 (0)

Range

1915–1998

1914–1998

Mean (SD)

1954 (13.4)

1952 (14.4)

Median (IQR)

1954 (17)

1951 (19)

Ethnicity

No. patients missing, n (%)

22,511 (95.8)

23,788 (95.6)

Unique values, n

76

83

3 most frequent values, n (%)

“Caucasian”: 623 (63.9)

“Aboriginal”: 103 (10.6)

“Canadian”: 64 (6.6)

“Caucasian”: 588 (53.4)

“Aboriginal”: 145 (13.2)

“Canadian”: 99 (9.0)

Occupation

No. patients missing, n (%)

16,810 (71.6)

18,423 (74.0)

Unique Values, n

3628

3536

3 most frequent values, n (%)

“Retired”: 1080 (16.2)

“Truck driver”: 125 (1.9)

“Farmer”: 103 (1.5)

“Retired”: 1250 (19.3)

“Homemaker”: 81 (1.3)

“Teacher”: 80 (1.2)

Education

No. patients missing, n (%)

22,866 (97.4)

24,262 (97.5)

Unique Values, n

10

12

3 most frequent values, n (%)

“University”: 184 (22.7)

“High School”: 176 (28.4)

“College”: 89 (14.4)

“University”: 188 (30.0)

“High School”: 175 (27.9)

“College”: 151 (24.1)

  1. IQR interquartile range, SD standard deviation
  2. aNote: sex was missing for 2 patients