Long-term trajectories of back pain: cohort study with 7-year follow-up

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Published online 2013 Dec 11. doi: 10.1136/bmjopen-2013-003838

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Table 1

Monthly probability of experiencing each level of back pain based on cluster membership at 7 years

	Cluster (trajectory) from 7-year follow-up analysis
	No/occasional pain	Persistent mild pain	Fluctuating pain	Persistent severe pain
Baseline
No pain	0.87	0.15	0.01	0.00
Mild–moderate pain	0.13	0.80	0.51	0.21
High pain	0.00	0.05	0.48	0.79
Month 1
No pain	0.85	0.06	0.00	0.00
Mild–moderate pain	0.15	0.91	0.62	0.17
High pain	0.00	0.04	0.38	0.83
Month 2
No pain	0.65	0.06	0.00	0.00
Mild–moderate pain	0.35	0.89	0.12	0.11
High pain	0.00	0.05	0.88	0.89
Month 3
No pain	0.70	0.07	0.01	0.00
Mild–moderate pain	0.30	0.86	0.58	0.17
High pain	0.00	0.07	0.42	0.83
Month 4
No pain	0.66	0.09	0.00	0.00
Mild–moderate pain	0.34	0.88	0.29	0.18
High pain	0.00	0.03	0.71	0.82
Month 5
No pain	0.75	0.26	0.19	0.00
Mild–moderate pain	0.25	0.69	0.73	0.02
High pain	0.00	0.05	0.09	0.98
Month 6
No pain	0.80	0.16	0.02	0.00
Mild–moderate pain	0.20	0.79	0.66	0.11
High pain	0.00	0.05	0.32	0.89