What can happen if the rise in the height of stairs is inconsistent?

An inconsistent rise in stair height can lead to falls and injuries primarily because it disrupts the uniformity needed for safe navigation. When individuals ascend or descend stairs, their feet depend on a predictable pattern to maintain balance and stability. If the rise varies, it can create confusion and increase the likelihood of missteps, which may result in falls. This can be particularly hazardous in situations where users are distracted or carrying items, as they may be unaware of the change in stair height. Therefore, maintaining consistent stair dimensions is crucial for ensuring safety and reducing the risk of accidents.

Other factors, like design aesthetics, construction costs, or structural stability, can be related to stairs' design and construction, but they do not directly impact the immediate safety concerns associated with inconsistent riser heights.