Figure 2From: The relationship between low back pain and leisure time physical activity in a working population of cleaners - a study with weekly follow-ups for 1 year Flow chart on text message survey participation. Participation in text message survey was offered to 238 cleaners and 188 consented to participate. Among the 188, 48 never responded, leaving 140 participants, who responded to both questions at least once and 95 still responded in week 12. In the last week (week 52) 46 participants still responded.Back to article page