WhatsApp-based Psycho-socio-educational Intervention (WeLove) for Prevention of Psychological and Sleep Problems in Pregnant Women and Their Partners: A Three-arm Double-blinded Pilot Randomised Controlled Trial

Depression, anxiety and stress symptoms will be assessed by the Chinese version of 21-item Depression Anxiety and Stress Scale (DASS-21). It has three subscales with seven items each: stress, anxiety, and depressive symptoms. Four-point rating scales, ranging from 0 (did not apply to me at all) to 3 (applied to me very much or most of the time), are used to categorise frequency and severity. The final scores are obtained by multiplying each subscale's values by two. Every subscale has a total score that varies from 0 to 42; a high score on any subscale denotes a higher level of stress, anxiety, and depressive symptoms

Subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, sleep medication, and daytime dysfunction will be assessed by the Chinese version of 19-item Pittsburgh Sleep Quality Index (PSQI). Subjective sleep quality, sleep latency, duration, habitual sleep efficiency, sleep disruptions, sleep medication, and daytime dysfunction are the seven components that comprise the components of the PSQI. The range of scores for each item is 0 (no difficulty) to 3 (extreme difficulty). The total score ranges between 0 and 21. Poorer quality of sleep is indicated by a higher overall score

Subjective well-being will be measured by the Chinese version of World Health Organization-Five Well-Being Index (WHO-5). It included 5 items. Each item is rated on a six-point Likert scale, ranging from 0 (at no time) to 5 (always), the total score range from 0 to 25. A higher score indicates greater mental well-being.