Table 1. Nature of Movement Difficulty and Percent Currently Pregnant Total n = 6,043.

Nature of movement difficultya	Unweighted N with difficulty	Weighted % with difficultyb	% currently pregnantc
…Walk a quarter of a mile—about 3 city blocks?	2,625	39.0	2.8
…Walk up 10 steps without resting?	1,973	27.9	2.6
…Stand or be on your feet for about 2 hours?	3,542	52.3	4.1
…Sit for about 2 hours?	2,504	35.9	2.9
…Stoop, bend, or kneel?	4,105	62.1	3.3
…Reach up over your head?	1,337	19.7	2.3
…Use your fingers to grasp or handle small objects?	1,075	17.1	0.7
… Lift or carry something as heavy as 10 pounds such as a full bag of groceries?	1,997	28.4	3.3

^aStem of question: “By yourself, and without using any special equipment, how difficult is it for you to …” Possible responses are: “not at all difficult,” “only a little difficult,” “only somewhat difficult,” “very difficult,” or “can't do at all.”

^bPercent of women in our final “chronic physical disability” group with each type of movement difficulty

^cPercent with response of “somewhat difficult,” “very difficult,” or “can't do at all.” These are the only responses used by the NCHS movement difficulty algorithm.