Distribution of Physical Functioning subscale scores measured in patients enrolled in the Frequent Hemodialysis Network Trial. The Physical Functioning subscale is composed of 10 questions about mobility (moving a table, pushing a vacuum, lifting or carrying groceries, climbing several flights of stairs, climbing 1 flight of stairs, bending or stooping, walking 1 mile, walking several blocks, and walking 1 block) and self-care (bathing or dressing oneself). These scales are scored from 0-100, with higher scores indicating better function. For composing this figure, scores were grouped by 5.