While some of the results are seemingly obvious (such as risk of injury being 2.7 times higher following "moderate to vigorous exercise"; or twenty five times higher after being distracted during an activity), others are less so.
Age is also a factor in risk of injury, and not in the way you might think - young people are significantly more likely to have an episode of acute low back pain after heavy lifting than older - perhaps wiser?? - people. Those old sayings about "lift with your head, not with your back" win out again!
Age also modified "the effect of exposure to... ...sexual activity", as the authors tactfully put it; meaning oldies were less likely to injure themselves engaged in the horizontal tango. No comment on that.
One result of the number-crunching was something not seen in this type of research before: the highest risk of developing low back pain is between 7am and midday.
TL;DR Range of psychosocial and physical factors increase risk of new episode of low back pain. Age and time of day also make a difference.