A case-control study of physical activity patterns and risk of non-fatal myocardial infarction

BMC Public Health

Table 3 Physical activity patterns from PCA in a case control study, Costa Rica, 1994 - 2004

	Components
Items	1^a	2^b	3^c	4^d
Sleep during weekday	94*	2	-9	-9
Sleep during weekend	94*	-2	-7	-7
Nap	4	0	-12	-38*
Lie in bed during the day to watch TV, read, and listen to music	-45*	-7	-17	-22
Sit, either at work or in activities such as driving, watching TV	-1	-28	-74*	-12
Stand in very light activities at work or at home such as filing, coping, and doing laundry	-7	-36*	63*	-8
Stand cleaning in general such as moping, brooming, garage, washing windows, and sidewalk	4	-1	55*	-15
Standing and squatting in the garden work such as weeding and watering	2	58*	3	-3
Work in agriculture (not vigorously) such as planting, picking coffee, and cultivating.	2	58*	-6	-17
Work in construction such as painting, chopping wood, and carpentry	2	14	-13	62*
Walk on flat terrain in the city	2	17	11	15
Do heavy and vigorous jobs which made you sweat such as shovelling, digging ditches, cutting trees	3	57*	-7	9
Walk on mountainous terrain (farm)	-3	47*	5	-5
Climb steps	2	-17	-8	64*
Practice sports, i.e. teams, such as soccer, basketball, and volleyball	0	-5	-7	13
Practice sports, i.e. running, bicycling, swimming, etc.	2	-2	-5	16
Practice any other sports (not listed above)	-9	-14	-7	-13
Move or carry very heavy items which made you sweat such as carrying furniture, luggage, and water	1	12	16	31*

^a Rest/sleep pattern; ^b agricultural job pattern; ^c light indoor activity patter; ^d manual labor job pattern.
Note: Component loadings are multiplied by 100 and rounded to the nearest integer. Values greater than 0.3 are flagged by an '*'. The patterns are named based on activities that have high positive loadings, for example the agricultural job pattern have high positive loadings on activities like “standing and squatting in the garden work” or “work in agriculture”, while it has high negative loadings in activities that are more representative of other patterns (i.e. “Stand in very light activities at work or at home such as filing, coping, and doing laundry”).

ISSN: 1471-2458