Table 1 Patients’ characteristics and urological symptoms before salt intake reduction in each group.

From: Efficacy of salt reduction for managing overactive bladder symptoms: a prospective study in patients with excessive daily salt intake

 

Entire cohort (n = 98)

R group (n = 71)

N-R group (n = 27)

p value

Sex; male/female

52/46

34/37

18/9

0.116

Age (years); mean ± SD

66.7 ± 11.5

67.7 ± 11.2

64.1 ± 12.0

0.175

Body mass index (kg/m2)

22.7 ± 3.5

22.4 ± 3.7

23.6 ± 3.0

0.140

Duration of illness (months)

19.7 ± 17.1

23.5 ± 20.5

18.4 ± 15.8

0.217

Drug for overactive bladder; n (%)

64 (65.3)

48 (67.6)

16 (59.3)

0.321

β3-adrenoceptor agonists

48 (75.0)

38 (79.2)

10 (62.5)

 

Antimuscarinic agents

16 (25.0)

10 (20.8)

6 (37.5)

 

Hypertension (%)

50 (59.2)

41 (57.8)

17 (63.0)

0.818

Diabetes mellitus (%)

16 (16.3)

13 (18.3)

3 (11.0)

0.545

Renal dysfunction (%)

31 (31.6)

21 (29.6)

10 (37.0)

0.478

Hyperlipidemia (%)

14 (14.3)

10 (14.1)

4 (14.8)

1.000

Fluid intake volume (mL/day)

2536.7 ± 627.4

2448.7 ± 699.7

2463.3 ± 559.4

0.923

*SUNa (mEq/L)

105.1 ± 45.7

108.5 ± 44.0

96.1 ± 49.5

0.001

Est. 24-h U-Na excretion (mEq/day)

173.3 ± 34.5

176.7 ± 38.8

164.3 ± 16.0

 < 0.001

Estimated daily salt intake (g/day)

10.2 ± 1.9

10.4 ± 2.2

9.6 ± 0.9

 < 0.001

Daytime frequency

8.4 ± 2.8

8.4 ± 2.8

8.4 ± 2.8

0.923

Nighttime frequency

2.5 ± 0.9

2.5 ± 1.0

2.3 ± 0.9

0.284

Voided volume (mL)

238.1 ± 22.2

247.8 ± 25.1

240.9 ± 24.0

0.616

Diurnal urine volume (mL)

1790.8 ± 559.5

1784.5 ± 585.3

1807.4 ± 495.3

0.620

Nocturnal urine volume (mL)

745.9 ± 188.8

757.0 ± 193.7

716.7 ± 175.4

0.284

Nocturnal polyuria index (%)

30.2 ± 7.2

30.7 ± 7.6

29.0 ± 6.3

0.459

OABSS

Q1. Daytime frequency

1.2 ± 1.1

1.2 ± 1.0

1.2 ± 1.4

0.993

Q2. Nocturia

2.1 ± 0.6

2.1 ± 0.5

2.1 ± 0.6

0.788

Q3. Urgency

2.3 ± 0.5

2.3 ± 0.5

2.2 ± 0.4

0.327

Q4. Urgency incontinence

1.3 ± 1.0

1.3 ± 1.0

1.3 ± 0.8

0.774

Total score

6.8 ± 1.9

6.9 ± 1.0

6.8 ± 2.0

0.775

  1. R group restricted group, N-R group non-restricted group, SUNa Na concentration in the spot urine, Est. 24-h U-Na estimated 24-h urinary Na, OABSS overactive bladder symptom score, QI, Q2, Q3, and Q4 questions 1, 2, 3, and 4, respectively.
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