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Table 3 Clinical characteristics by using or not using dietary supplements (N = 348)

From: Common use of dietary supplements for bipolar disorder: a naturalistic, self-reported study

Clinical characteristics

Using dietary supplements (N = 101)

Not using dietary supplements (N = 247)

Test

Value

df

P

Taking mood stabilizer N (%)a

  

Χ 2b

1.367

1

0.242

 Yes

73 (72.3)

193 (78.1)

    

 No

28 (27.7)

54 (21.9)

    

Taking antidepressant N (%)a

  

Χ 2

0.573

1

0.449

 Yes

54 (53.5)

143 (57.9)

    

 No

47 (46.5)

104 (42.1)

    

Taking antipsychotic N (%)a

  

Χ 2

0.340

1

0.560

 Yes

41 (40.6)

92 (37.2)

    

 No

60 (59.4)

155 (62.8)

    

Taking benzodiazepine N (%)a

  

Χ 2

0.016

1

0.901

 Yes

26 (25.7)

62 (25.1)

    

 No

75 (74.3)

185 (74.9)

    

Percentage of days depressed, mean (SD)

22.4 (22.4)

22.2 (23.6)

t c

−0.074

194

0.941

Percentage of days euthymic, mean (SD)

70.5 (24.3)

68.7 (26.8)

t

−0.584

204

0.560

Percentage of days manic, mean (SD)

7.1 (10.3)

9.0 (13.5)

t

1.437

241

0.152

Percentage of days severely depressed, mean (SD)

8.3 (15.1)

7.4 (15.7)

t

−0.484

192

0.629

Percentage of days severely manic, mean (SD)

0.7 (2.4)

1.2 (4.7)

t

1.380

330

0.169

Hospitalizations, mean number (SD)

2.1 (4.7)

1.9 (3.2)

t

−0.482

141

0.630

Age of onset, mean age (SD)

20.0 (8.2)

20.6 (9.7)

t

0.545

198

0.586

Years of illness, mean years (SD)

21.9 (13.1)

18.45 (11.9)

t

−2.262

174

0.025

  1. aTaking for 50 % or more days in study
  2. bPearson’s chi-square, asymptotic two-sided
  3. cEqual variances not assumed