Fig. 1.

Median number of steps per day in each month in relation to the monthly mean temperature.

Two-piece linear regression equations:

$$\begin{array}{l}\mathrm{M}<65:y=\left\{\begin{array}{c}\hfill 47.7x+8822.3x<19.4\hfill \\ \hfill -98.0x+11648.1x\ge 19.4\hfill \end{array}\right)\left(R^2=0.799\right)\\ \mathrm{M}\ge 65:y=\left\{\begin{array}{c}\hfill 52.5x+8222.3x<20.2\hfill \\ \hfill -187.9x+13073.7x\ge 20.2\hfill \end{array}\right)\left(R^2=0.828\right)\\ \mathrm{F}<65:y=\left\{\begin{array}{c}\hfill 46.4x+6795.4x<20.4\hfill \\ \hfill -129.3x+10375.2x\ge 20.4\hfill \end{array}\right)\left(R^2=0.876\right)\\ \mathrm{F}\ge 65:y=\left\{\begin{array}{c}\hfill 51.8x+6079.5x<20.7\hfill \\ \hfill -183.1x+10933.1x\ge 20.7\hfill \end{array}\right)\left(R^2=0.848\right)\end{array}$$

The coordinates of each point are shown in Supplemental Table 2.

The coordinates of each point are shown in Supplemental Table 2.