Gender

Visit vs 9:30 AM - how long since last caffeinated drink
N Mean StdDev Median Min Max Unknown Total
Visit 5 593 4.5 ± 0.7 5.0 1.0 5.0 142 735
Participant's age (category) vs 9:30 AM - how long since last caffeinated drink
Visit 5
N Mean StdDev Median Min Max Unknown Total
Total 532 4.5 ± 0.7 5.0 1.0 5.0 126 658
5-14 yrs old 56 4.6 ± 0.8 5.0 1.0 5.0 8 64
15-24 yrs old 103 4.6 ± 0.6 5.0 1.0 5.0 9 112
25-34 yrs old 56 4.6 ± 0.6 5.0 2.0 5.0 6 62
35-44 years 81 4.4 ± 0.7 4.0 1.0 5.0 17 98
45-54 years 114 4.5 ± 0.6 5.0 1.0 5.0 34 148
55-64 years 58 4.6 ± 0.6 5.0 3.0 5.0 26 84
65-74 years 38 4.5 ± 0.5 5.0 4.0 5.0 19 57
75-84 years 24 4.4 ± 1.1 5.0 1.0 5.0 7 31
85 years or older 2 4.5 ± 0.7 4.5 4.0 5.0 - 2
Participant's sex vs 9:30 AM - how long since last caffeinated drink
Visit 5
N Mean StdDev Median Min Max Unknown Total
Total 593 4.5 ± 0.7 5.0 1.0 5.0 142 735
Female 326 4.5 ± 0.7 5.0 1.0 5.0 80 406
Male 267 4.5 ± 0.7 5.0 1.0 5.0 62 329
Participant's race vs 9:30 AM - how long since last caffeinated drink
Visit 5
N Mean StdDev Median Min Max Unknown Total
Total 593 4.5 ± 0.7 5.0 1.0 5.0 142 735
White 258 4.5 ± 0.6 4.0 1.0 5.0 46 304
Black 316 4.5 ± 0.8 5.0 1.0 5.0 93 409
More than one race 19 4.8 ± 0.4 5.0 4.0 5.0 3 22