Table 2 Revised protocol to improve attendance at workshop

 (a) Workshop leaders leading the introductory talks were asked to increase participants’ hope of improvement as a result of attending the workshop programme

 (b) Workshop leaders at the talks were asked to emphasise the importance of answering all questions, or else there would be a delay in letters being sent out about the workshops

 (c) Additional research volunteers were recruited and sent to introductory talks and asked to check baseline data quality on the day itself

 (d) To maintain engagement, research workers were asked to email/telephone within 1 week after the introductory talk or immediately after randomisation to inform participants about the workshop to which they had been allocated