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Table 1 Baseline characteristics of included participants

From: Association between indoor ventilation frequency and cognitive function among community-dwelling older adults in China: results from the Chinese longitudinal healthy longevity survey

Characteristics

Indoor ventilation frequency

Total

N = 11,853

(100.0%)

P-value a

Low (0–3)

N = 1133

(9.6%)

Intermediate (4–5)

N = 3858

(32.6%)

High (6–8)

N = 6862

(57.9%)

Age, years, Mean (SD)

85.9 (11.0)

83.4 (11.0)

83.3 (11.1)

83.6 (11.1)

0.689

Female, Count (%)

646 (57.0)

2071 (53.7)

3739 (54.5)

6456 (54.5)

0.140

Education (years), Count (%)

    

< 0.001

None (0)

824 (72.7)

2235 (57.9)

3367 (49.1)

6426 (54.2)

 

Primary school (1–6)

171 (15.1)

724 (18.8)

1437 (20.9)

2332 (19.7)

 

Middle school or higher (> 6)

138 (12.2)

899 (23.3)

2058 (30.0)

3095 (26.1)

 

Residence, Count (%)

    

< 0.001

 Rural

663 (58.6)

1918 (49.8)

2644 (38.6)

5225 (44.1)

 

 Urban

468 (41.4)

1934 (50.2)

4209 (61.4)

6611 (55.9)

 

Marital status, Count (%)

    

< 0.001

Married and living with spouse

725 (64.0)

2152 (55.8)

3806 (55.5)

6683 (56.4)

 

 Others

408 (36.0)

1706 (44.2)

3056 (44.5)

5170 (43.6)

 

MMSE score, Count (%)

    

< 0.001

 Severe (< 10)

99 (8.7)

198 (5.1)

371 (5.4)

668 (5.6)

 

 Moderate (10–18)

164 (14.5)

314 (8.1)

536 (7.8)

1014 (8.6)

 

 Mild (19–23)

167 (14.7)

447 (11.6)

739 (10.8)

1353 (11.4)

 

 Normal (> 23)

703 (62.0)

2899 (75.1)

5216 (76.0)

8818 (74.4)

 

Depressive symptom, Count (%)

    

< 0.001

Without

325 (32.7)

1401 (39.0)

3195 (49.4)

4921 (44.5)

 

With

670 (67.3)

2193 (61.0)

3270 (50.6)

6133 (55.5)

 

Family annual income, Count (%)

    

< 0.001

 < 30,000

704 (62.1)

1757 (45.5)

2475 (36.1)

4936 (41.6)

 

 ≥30,000

429 (37.9)

2101 (54.5)

4387 (63.9)

6917 (58.4)

 

Dietary diversity, Count (%)

    

< 0.001

 Low

988 (88.3)

2910 (76.7)

4887 (71.8)

8785 (74.9)

 

 High

131 (11.7)

882 (23.3)

1924 (28.2)

2937 (25.1)

 

Smoking, Count (%)

    

0.047

Non-current

970 (85.6)

3266 (84.7)

5714 (83.3)

9950 (83.9)

 

Current

163 (14.4)

592 (15.3)

1148 (16.7)

1903 (16.1)

 

Alcohol drinking, Count (%)

    

0.092

Non-current

977 (86.2)

3301 (85.6)

5786 (84.3)

10,064 (84.9)

 

Current

156 (13.8)

557 (14.4)

1076 (15.7)

1789 (15.1)

 

Physical activity, Count (%)

    

< 0.001

Regularly at present

892 (78.7)

2847 (73.8)

4166 (60.7)

7905 (66.7)

 

Not regularly at present

241 (21.3)

1011 (26.2)

2696 (39.3)

3948 (33.3)

 

BMI (kg/m2), mean (SD)

22.1 (3.8)

22.6 (3.8)

22.6 (3.8)

22.5 (3.8)

0.972

ADL condition, Count (%)

    

0.089

Not impaired

867 (76.5)

3069 (79.5)

5417 (78.9)

9353 (78.9)

 

Impaired

266 (23.5)

789 (20.5)

1445 (21.1)

2500 (21.1)

 

Leisure activity, Count (%)

    

< 0.001

Not impaired

342 (30.2)

1558 (40.4)

3288 (47.9)

5188 (43.8)

 

Impaired

791 (69.8)

2300 (59.6)

3574 (52.1)

6665 (56.2)

 
  1. Abbreviations: ADL Activities of Daily Living, BMI Body Mass Index
  2. a P-values were calculated from chi-square tests or analysis of variance
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