In a randomized parallel group design substudy , @ consenting participants recruited from primary care to a trial of acupuncture for IBS ( ISRCTN @ ) were randomized to receive a one-question SMS message at either @:@ am or at @:@ pm for @days : `` On a scale of @-@ , with @ being no symptoms and @ being the worst symptoms you could have , how would you score your IBS symptoms now ?