Name

caffeine

Label

Sleep Diary: amount of tea/coffee/cola on day of study

Type
numeric
Visit vs Sleep Diary: amount of tea/coffee/cola on day of study
N Mean StdDev Median Min Max Unknown Total
Visit 5 214 1.4 ± 1.7 1.0 -2.0 8.0 521 735
Age at time of visit vs Sleep Diary: amount of tea/coffee/cola on day of study
Visit 5
N Mean StdDev Median Min Max Unknown Total
Total 193 1.4 ± 1.7 1.0 -2.0 8.0 465 658
5-14 yrs old 12 0.8 ± 1.0 0.5 0.0 3.0 52 64
15-24 yrs old 39 0.7 ± 1.1 0.0 0.0 4.0 73 112
25-34 yrs old 19 1.6 ± 2.2 1.0 -2.0 7.0 43 62
35-44 years 29 1.6 ± 1.7 1.0 0.0 7.0 69 98
45-54 years 51 1.5 ± 1.8 1.0 -2.0 8.0 97 148
55-64 years 14 2.9 ± 2.0 3.0 0.0 7.0 70 84
65-74 years 17 1.5 ± 1.5 2.0 0.0 5.0 40 57
75-84 years 11 1.8 ± 1.3 2.0 0.0 4.0 20 31
85 years or older 1 1.0 - 1.0 1.0 1.0 1 2
Sex vs Sleep Diary: amount of tea/coffee/cola on day of study
Visit 5
N Mean StdDev Median Min Max Unknown Total
Total 214 1.4 ± 1.7 1.0 -2.0 8.0 521 735
Female 129 1.4 ± 1.7 1.0 -2.0 8.0 277 406
Male 85 1.5 ± 1.6 1.0 -2.0 7.0 244 329
Race vs Sleep Diary: amount of tea/coffee/cola on day of study
Visit 5
N Mean StdDev Median Min Max Unknown Total
Total 214 1.4 ± 1.7 1.0 -2.0 8.0 521 735
White 119 1.9 ± 1.8 2.0 0.0 8.0 185 304
Black 92 0.8 ± 1.3 0.0 -2.0 6.0 317 409
Other 3 1.0 ± 1.0 1.0 0.0 2.0 19 22