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Table 2 Baseline characteristics of those aged 65-80, by treatment: age, sex, race, height, weight, BMI and medication use.

From: Nightly treatment of primary insomnia with prolonged release melatonin for 6 months: a randomized placebo controlled trial on age and endogenous melatonin as predictors of efficacy and safety

   

All

First randomization

Second randomization

    

PRM

Placebo

PRM

Placebo

  

N

281

137

144

198

75

Characteristic

Visit

      

Age (years)

1

Mean (SD)

71.0 (4.1)

71.1 (3.8)

70.9 (4.4)

70.9 (3.9)

70.9 (4.4)

Sex

 

N (%) female

182 (64.8%)

89 (65.0%)

93 (64.6%)

128 (64.6%)

50 (66.7%)

Race*

 

N (%) white

280 (100.0%)

137 (100.0%)

143 (100.0%)

198 (100.0%)

74 (100.0%)

Height (m)

1

Mean (SD)

1.65 (0.09)

1.65 (0.09)

1.64 (0.09)

1.65 (0.09)

1.64 (0.09)

Weight (kg)

1

Mean (SD)

73.3 (13.0)

73.1 (14.1)

73.6 (11.8)

73.2 (13.2)

74.1 (12.6)

BMI (kg/m2)

1

Mean (SD)

27.0 (3.8)

26.8 (3.6)

27.3 (3.9)

26.8 (3.6)

27.7 (4.2)

Taking any

medications

1

N (%)

265 (94.3%)

130 (94.9%)

135 (93.8%)

187 (94.4%)

70 (93.3%)

Taking codeine†

1

N (%)

73 (26.2%)

35 (25.7%)

38 (26.6%)

50 (25.5%)

20 (26.7%)

Taking codeine

2

N (%)

58 (20.6%)

28 (20.4%)

30 (20.8%)

40 (20.2%)

16 (21.3%)

Confirmed

codeine analgesic

2

N (%)

43 (15.3%)

18 (13.1%)

25 (17.4%)

25 (12.6%)

16 (21.3%)

  1. *One patient missed observation
  2. †Two patients missed observations at Visit 1
  3. PRM, prolonged release melatonin; SD, standard deviation