Absence of low back pain in patients followed weekly over one year with automated text messages

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Published online 2012 Mar 29. doi: 10.1186/2045-709X-20-9

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Table 2

Description of missing information in two populations followed over 1 year with weekly text messages

	Study 1	Study 2
Number of weeks with no text-message response	Number of participants (%)	Number of participants (%)

0	58 (72.5)	83 (40)

1-5	17 (21)	84 (40)

6-10	3 (4)	15 (7)

11-26	2 (2.5)	27 (13)

27 + *

Study 1 (N = 80) consisted of participants with Modic changes and study 2 (N = 209) included participants with non-specific low back pain.

* Participants with 27 or more missing weeks had been excluded from the analyses already from the beginning