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For comparison of brightness settings across the different age groups, instrument panel (IP) (dashboard) brightness settings in the vehicles were recorded using the control setting selected by the participants. Absolute measures of brightness for the different vehicle and systems were not collected. Measures were made by dividing the range of each vehicle’s IP physical adjustment range approximately into eighths. The final position of the control as set by the participant was recorded within this range. Due to different controls in each vehicle, only the settings for SUV 3 are used here for comparison of IP brightness across the age groups. Figure 82 indicates the mean setting of the IP brightness control and standard error for each of the age groups.
Similarly, in-vehicle display brightness settings were recorded by dividing each vehicle’s in-vehicle display physical adjustment range approximately into eighths. The final position of the control within this range- as set by the participant was recorded. Figure 83 indicates the mean in-vehicle display brightness setting and standard error for each of the age groups in each vehicle. Due to different controls in each vehicle and different gain on the controls, comparison is not possible from vehicle to vehicle.
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