Table 1.

Summary of Baseline Characteristics by Physical Activity Trajectory Profiles Derived From the Joint Latent Class and Survival Mixture Analysis, Women's Health and Aging Study II, 1994–2009

Characteristic	Physical Activity Trajectory Profilea
	Total Sample (n = 433)b		Always Active (n = 72, 16.6%)		Stable Moderate (n = 140, 32.3%)		Fast Declining (n = 83, 19.2%)		Always Sedentary (n = 138, 31.9%)
	No.	%	No.	%	No.	%	No.	%	No.	%
Age, yearsc	73.9 (2.8)		74.1 (3.1)		73.3 (2.7)		74.3 (2.6)		74.2 (2.8)
Race
White	352	81.3	64	88.9	108	77.1	70	84.3	110	79.7
Black	80	18.7	7	9.7	32	22.9	13	15.7	28	20.3
Other	1	0.2	1	1.4	0	0	0	0	0	0
Years of educationc	12.5 (3.3)		13.2 (3.2)		12.5 (3.1)		12.0 (3.6)		12.5 (3.4)
Living alone	222	51.3	38	52.8	61	43.6	48	57.8
Body mass indexd,e
<18.5	14	3.2	5	6.9	3	2.1	2	2.4	4	2.9
18.5–24.9	154	35.6	32	44.4	48	34.3	27	32.5	47	34.1
25–29.9	164	37.9	28	38.9	54	38.6	40	48.2	42	30.4
≥30	99	22.9	7	9.7	34	24.3	14	16.9	44	31.9
Self-reported health
Excellent	69	15.9	14	19.4	29	20.7	9	10.8	17	12.3
Very good	145	33.5	31	43.1	50	35.7	33	39.8	31	22.5
Good	173	40.0	25	34.7	46	32.9	32	38.6	70	50.7
Fair/poor	46	10.7	2	2.8	15	10.7	9	10.8	20	14.5
No. of diseasesc,f	1.6 (1.0)		1.3 (0.9)		1.5 (1.0)		1.5 (1.0)		1.8 (1.1)
Coronary artery disease	66	15.2	4	5.6	20	14.3	10	12.1	32	23.2
Chronic obstructive pulmonary disease	100	23.1	9	12.5	28	20.0	23	27.7	40	29.0
Diabetes	33	7.6	5	6.9	10	7.1	3	3.6	15	10.9
Osteoarthritis	288	66.5	48	66.7	89	63.6	56	67.5	95	68.8
Cancer	36	8.3	7	9.7	9	6.4	7	8.4	13	9.4
Physical activityg
Inactive	185	42.7	11	15.3	43	30.7	22	26.5	109	79.0
Moderately active	99	22.9	17	23.6	61	43.6	5	6.0	16	12.0
Active	149	34.4	44	61.1	36	25.7	56	67.5	13	9.4
Types of physical activity
Walk for exercise	243	56.1	54	75.0	78	55.7	49	59.0	62	44.9
Exercise	85	19.6	23	31.9	31	22.1	19	22.9	12	8.7
Dancing	64	14.8	21	29.2	21	15.0	12	14.5	10	7.2
Bowling	24	5.5	9	12.5	6	4.3	9	10.8	0	0
Strenuous household chores	305	70.4	53	73.6	114	81.4	69	83.1	69	50.0
Strenuous outdoor chores	127	29.3	31	43.1	41	29.3	29	34.9	26	18.8
Smoking status
Never smoker	237	54.7	43	59.7	79	56.4	48	57.8	67	48.6
Former smoker	152	35.1	22	30.6	46	32.9	30	36.1	54	39.1
Current smoker	44	10.2	7	9.7	15	10.7	5	6.0	17	12.3
Geriatric Depression Scale scoreh	3 (1–6)		2 (1–3)		3 (1–5)		3 (1–5.5)		4 (2–7)
Geriatric Depression Scale score ≥10	36	8.3	0	0	14	10.0	5	6.0	17	12.3
Mobility disability	133	30.7	13	18.1	39	27.9	17	20.5	64	46.4
Self-efficacy
High	262	60.5	53	73.6	87	62.1	48	57.8	74	53.6
Medium	119	27.5	14	19.4	40	28.6	21	25.3	44	31.9
Low	52	12.0	5	6.9	13	9.3	14	16.9	20	14.5
Energy leveli	8 (7–9)		8.5 (7–10)		8 (7–9)		8 (7–9)		7 (6–8)

^a Estimated from the joint latent class and survival model.

^b Three of the 436 women were missing data on activity measures and were therefore excluded from the analysis.

^c Values are mean (standard deviation).

^d Percentages may not add up to 100 because of missing data.

^e Weight (kg)/height (m)².

^f Presence of definite diseases, including angina pectoris/myocardial infarction, congestive heart failure, peripheral artery disease, hip fractures, osteoarthritis of the hip, knee and/or hand, Parkinson's disease, rheumatoid arthritis, osteoporosis, stroke, pulmonary diseases, diabetes mellitus, cancer, spinal stenosis, and disc disease.

^g Based on the National Health Interview Survey criteria.

^hValues are median (interquartile range).