Sampling
Anxiety
The researcher was referred to 35 elementary girl schools in Tabriz, randomly selected from five educational districts. She received the numbers of the mothers from the school officials, then contacted all of them and asked about the appearance of puberty symptoms in their daughters. They were assessed based on the inclusion and exclusion criteria. Potential mothers were invited to attend a face-to-face meeting held at the school. The objectives and methods were fully explained at the meeting, and a written consent form was signed by the mothers who were willing to participate in the study. The questionnaires of Spielberger State-Trait Anxiety Inventory (STAI) and Perceived Stress Scale (PSS) were filled out. Mothers who scored 35–65 (moderate and relatively severe) on STAI and above 21.8 on PSS were included. Next the questionnaires of socio-demographic characteristics and quality of life (SF-36) were completed.