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Table 1 The baseline characteristics of constipation and normal participant

From: Association of niacin intake with constipation in adult: result from the National Health and Nutrition Examination

Characteristic

Normal, N = 3900 (78%)a

Constipation, N = 1270 (22%)a

P-valueb

Age

0.077

 20–45 years

75,882,410 (49%)

19,870,882 (44%)

 

 46–65 years

55,147,795 (36%)

16,854,954 (38%)

 

 65 + years

23,707,593 (15%)

7,994,405 (18%)

 

Sex

 < 0.001

 Male

83,596,622 (54%)

14,251,719 (32%)

 

 Female

71,141,176 (46%)

30,468,521 (68%)

 

Race

0.009

 Non-Hispanic White

109,726,900 (71%)

29,105,702 (65%)

 

 Mexican American

12,048,999 (7.8%)

4,623,380 (10%)

 

 Non-Hispanic Black

16,599,399 (11%)

5,497,275 (12%)

 

 Other Hispanic

7,376,470 (4.8%)

2,863,968 (6.4%)

 

 Other

8,986,030 (5.8%)

2,629,915 (5.9%)

 

Marital status

0.015

 Widowed/divorced/separated

27,330,217 (18%)

9,046,101 (20%)

 

 Never married

30,288,229 (20%)

6,273,186 (14%)

 

 Married/living with partner

96,985,514 (63%)

29,400,953 (66%)

 

BMI

0.6

 Underweight (< 18.5)

2,775,474 (1.8%)

527,099 (1.2%)

 

 Normal (18.5 to < 25)

43,501,329 (28%)

12,905,615 (29%)

 

 Overweight (25 to < 30)

51,690,803 (33%)

14,732,326 (33%)

 

 Obese (30 or greater)

56,770,192 (37%)

16,555,200 (37%)

 

Alcohol

 < 0.001

 Non-drinker

30,105,255 (19%)

12,504,728 (28%)

 

 1–5 drinks/month

73,992,095 (48%)

22,193,893 (50%)

 

 5–10 drinks/month

16,646,996 (11%)

3,516,618 (7.9%)

 

 10 + drinks/month

33,993,453 (22%)

6,505,001 (15%)

 

Smoke

0.5

 Never smoker

85,728,507 (55%)

23,644,148 (53%)

 

 Former smoker

38,726,830 (25%)

11,076,679 (25%)

 

 Current smoker

30,282,461 (20%)

9,999,413 (22%)

 
  1. an (%)
  2. bChi-squared test with Rao and Scott's second-order correction