Mobile Phone Text for Optimizing Asthma Treatment

"The intervention consisted of sequences of SMS messages sent to the intervention group, each containing 2 or 3 monitoring questions and one reminder to take the preventive medication. The SMS sequence was as follows.~1. Remember to take your preventive asthma medication (sent at 8.00 am).~2. Were you awakened during the night due to your asthma? Answer YES or NO.~3. How many times have you taken your asthma attack medication during the last 24 hours? Answer a number.~4. What was your peak flow this morning? Answer a number (optional, depending on the participant's use of a spirometer prior to the study)."