From: Variability and seasonality of active transportation in USA: evidence from the 2001 NHTS
 | Age groups | 5-10 years | 11-17 years | 18-64 years | 65+ years |
---|---|---|---|---|---|
 | Number | 11556 | 13651 | 84712 | 20303 |
Sex | Male | 1 | 1 | 1 | 1 |
 | Female | 0.84 | 0.87 | 1.12 | 0.87 |
Race/ethnicity | White | 1.00 | 1.00 | 1.00 | 1.00 |
 | Black | 0.98 | 1.50 | 0.880 | 0.96 |
 | Asian | 0.67 | 0.79 | 0.82 | 0.70 |
 | Hispanic | 0.99 | 0.95 | 0.83 | 1.15 |
Household income level | < 20 k | 1.00 | 1.00 | 1.00 | 1.00 |
 | 20-40 k | 0.81 | 0.93 | 0.67 | 0.91 |
 | 40-80 k | 0.68 | 0.76 | 0.69 | 1.13 |
 | > 80 k | 0.64 | 0.53 | 0.86 | 1.36 |
Region | Northeast | 1.00 | 1.00 | 1.00 | 1.00 |
 | Midwest | 0.70 | 0.85 | 0.67 | 0.84 |
 | South | 0.58 | 0.58 | 0.56 | 0.68 |
 | West | 0.93 | 0.93 | 0.73 | 1.07 |
Urbanization level | Rural | 1.00 | 1.00 | 1.00 | 1.00 |
 | Town | 1.46 | 1.16 | 1.24 | 1.00 |
 | Suburban | 1.61 | 1.52 | 1.39 | 1.31 |
 | Second city | 1.59 | 1.63 | 1.84 | 1.38 |
 | Urban | 2.43 | 1.91 | 3.00 | 1.99 |
Month | January | 1.00 | 1.00 | 1.00 | 1.00 |
 | February | 1.13 | 1.22 | 0.98 | 1.02 |
 | March | 0.95 | 0.92 | 0.90 | 0.85 |
 | April | 1.33 | 1.38 | 1.35 | 1.09 |
 | May | 1.67 | 1.54 | 1.46 | 1.19 |
 | June | 2.02 | 1.54 | 1.33 | 1.12 |
 | July | 1.09 | 1.06 | 1.27 | 1.36 |
 | August | 1.48 | 1.36 | 1.37 | 1.10 |
 | September | 1.20 | 1.31 | 1.10 | 1.02 |
 | October | 1.18 | 1.22 | 1.20 | 1.10 |
 | November | 1.39 | 0.95 | 1.08 | 0.99 |
 | December | 0.86 | 0.95 | 0.91 | 0.94 |