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Table 4 Final covariates of excluded and modeled participants

From: Effect of sunlight exposure on cognitive function among depressed and non-depressed participants: a REGARDS cross-sectional study

Characteristics Participants in the Final Model Excluded Participants p-value
  N (%) N (%)  
   Total 14,474 (73) 5378 (27)  
   Male 5944 (41) 1887 (35) <.0001
   Education    
Less than High School 1670 (12) 798 (15)  
High School 3751 (26) 1525 (28) <.0001
Some College 3963 (27) 1407 (26)  
College Diploma 5090 (35) 1628 (30)  
   Income    
Less than $20,000 per year 3071 (21) 623 (22)  
$20,000 to $35,000 per year 3991 (28) 797 (28) 0.42
$35,000 to $75,000 per year 4904 (34) 914 (32)  
$75,0000 or more per year 2508 (17) 484 (17)  
   Age    
Less than 55 years 1885 (13) 585 (11)  
55 to 59 years 2583 (18) 848 (16)  
60 to 64 years 2759 (19) 1052 (20) <.0001
65 to 69 years 2654 (18) 1038 (19)  
70 to 74 years 2063 (14) 758 (14)  
75 to 79 years 1443 (10) 653 (12)  
80 or more years 1087 (8) 436 (8)  
   Black 6291 (44) 2046 (38) <.0001
   Region    
Non Belt/Buckle 6802 (47) 2158 (40)  
Stroke Belt 5228 (36) 2074 (39) <.0001
Stoke Buckle 2444 (17) 1145 (21)  
   Season    
Summer 5542 (38) 2080 (39)  
Fall 2957 (20) 1116 (21) 0.76
Winter 2891 (20) 1040 (19)  
Spring 3084 (21) 1142 (21)  
   Never Used Alcohol 4291 (30) 1842 (34) <.0001
   Depressed 1605 (11) 653 (13) 0.0047
   PCS-12 (mean, stddev) 46.2 (10.6) 45.9 (10.5) 0.0449
  1. stddev = standard deviation; PCS = Physical Components Summary
  2. P-values for categorical variables provided from a chi squared test statistic and for continuous variables provided from a pooled t-test statistic calculated for each variable by inlcusion status.