Academic Staff

Dr. Chung

Dr. CHUNG Ka Fai 鍾家輝

MBBS(HK), MEd W'gong, MRCPsych, FHKCPsych, FHKAM(Psychiatry)

Associate Professor
Director of Graduate Research Studies
Chairperson of the Departmental Research Postgraduate Committee
Honorary Consultant
The HKU Scholars Hub Page address:
Scopus Author ID: 56431269300

Research Interests:

Full Publication List

Selected Publications:

1. Chung KF, Yeung WF, Yu YM, Yung KP, Zhang SP, Zhang ZJ, Wong MT, Lee WK, Chan LW. Acupuncture for residual insomnia associated with major depressive disorder: a placebo- and sham-controlled, subject- and assessor-blind, randomized trial. Journal of Clinical Psychiatry 2015;76:e752-e760.

We examined the efficacy and safety of acupuncture for residual insomnia in patients with a past history of major depression. Although acupuncture was well tolerated, its efficacy was only mild and similar to that of minimal acupuncture and placebo acupuncture. The finding underscores the difficulties in the treatment of residual insomnia in major depressive disorder. 

2. Chung KF, Yeung WF, Ho FY, Yung KP, Yu YM, Kwok CW. Cross-cultural and comparative epidemiology of insomnia: the Diagnostic and Statistical Manual (DSM), International Classification of Diseases (ICD) and International Classification of Sleep Disorders (ICSD). Sleep Medicine 2015;16:477-82.

This is the first territory-wide survey using a validated interview on the prevalence of insomnia according to standardized diagnostic criteria. We found that 22.1% of the general population suffered from DSM-IV insomnia disorder. The prevalence was similar to that obtained in the United States, suggesting that cross-cultural difference in the prevalence of insomnia disorder is less than what we have expected.

3. Yeung WF, Chung KF, Poon MM, Ho FY, Zhang SP, Zhang ZJ, Ziea ET, Wong VT. Chinese herbal medicine for insomnia: a systematic review of randomized controlled trials. Sleep Medicine Reviews 2012;16:497-507.

Chinese herbal medicine is commonly used for the treatment of insomnia and is one of the most common over-the-counter sleeping pills. This study is the first systematic review and meta-analysis of English and Chinese literature on the efficacy and safety of Chinese herbal medicine for insomnia. The study identifies the most frequently used herbal formulas for insomnia. The findings provide useful information for future studies on Chinese herbal formulas and individualized herbal treatment for insomnia.

4. Ho FY, Chung KF, Yeung WF, Ng TH, Kwan KS, Yung KP, Cheng SK. Self-help cognitive-behavioral therapy for insomnia: a meta-analysis of randomized controlled trials. Sleep Medicine Reviews 2015;19C:17-28.

Cognitive-behavioral therapy is one of the recommended non-drug treatments for insomnia. The use of less intensive and less costly approach to deliver treatment is increasingly popular.

5. Ho YY, Chung KF, Yeung WF. Ng TH, Cheng SK. Weekly brief phone support in self-help cognitive behavioral therapy for insomnia disorder: relevance to adherence and efficacy. Behaviour Research and Therapy 2014;63:147-56.

Although cognitive-behavioral therapy is commonly used in Western countries, randomized controlled studies of its efficacy have been limited in Chinese population. We conducted the first randomized trial on the efficacy and adherence of cognitive-behavioral therapy for insomnia in Hong Kong.

6. Chung KF, Yeung WF, Zhang ZJ, Yung KP, Man SC, Lee CP, Lam SK, Leung TW, Leung KY, Ziea E, Wong VT. Randomized non-invasive sham-controlled pilot trial of electroacupuncture for postpartum depression. Journal of Affective Disorders 2012;142:115-21. 
7. Yeung WF, Chung KF, Tso KF, Zhang SP, Zhang ZJ, Ho LM. Electroacupuncture for residual insomnia associated with major depressive disorder: a randomized controlled trial. Sleep 2011;34:807-815.

This study extends our early research on acupuncture for insomnia. We targeted a slightly more complicated clinical population. Again, we found a slight advantage of acupuncture over placebo acupuncture, but no difference from minimal acupuncture, which used superficial needling at non-acupoints. The study provides important data for understanding the therapeutic components of acupuncture and challenges the traditional Chinese medicine theory of the importance of acupoint selection.

8. Chung KF, Kan KK, Yeung WF. Assessing insomnia in adolescents: comparison of Insomnia Severity Index, Athens Insomnia Scale and Sleep Quality Index. Sleep Medicine 2011;12:463-470.
9. Yeung WF, Chung KF, Zhang SP, Yap TG, Law AC. Electroacupuncture for primary insomnia: a randomized controlled trial. Sleep 2009;32:1039-47.

Insomnia is one of the most common health complaints. This is the first randomized, placebo-controlled study on the use of acupuncture for the treatment of primary insomnia. We used a well-documented screening procedure, randomization, non-invasive placebo acupuncture needles, validated subjective scales, and objective measures. We found a slight advantage of electroacupuncture over non-invasive placebo acupuncture for treating insomnia. The study provides data on the use of traditional Chinese medicine approaches for insomnia.

10. Chung KF, Cheung MM. Sleep-wake patterns and sleep disturbance among Hong Kong Chinese adolescents. Sleep 2008;31:185-94.

This study represents the first systematic analysis of sleep-wake patterns and sleep disturbance among Hong Kong adolescents. We found that many adolescents had insufficient sleep and sleep-wake disturbances. Given the negative consequences of sleep problems, educational programs on sleep health should be specially designed and targeted at adolescents. The paper has been cited 88 times according to Scopus as on 5 Oct 2015.