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The Philippine Chronotype and Social Jetlag Survey  
Registry ID: PHRR141125-000858
Secondary Identification Number: UPMREB 2013-044-01, PCHRD Project No. FP 140028

Scientific Title

PhilSHIFT Project 1 - Chronotype of Filipino non-shift workers and shift workers

Project Description

Project 1 of the University of the Philippines’ PhilSHIFT Research Group aims to further PhilSHIFT’s database of chronotypes of non-shift working Filipinos and develop a tool for chronotype evaluation of Filipino shift workers. They are intended as references and tools for future chronotype and shift work research in the Philippines.

This study is the first project under the research program “Chronotype-Specific Adjustment to Shift Work of Contact Center Agents in the Philippines”. A later study will look at the chronotype, health, and experience of newly-hired contact center agents as they pursue permanent night work.
PhilSHIFT is a collaborative research program of the University of the Philippines Center for Integrative and Development Studies (CIDS). Its research projects concern the Filipino chronotype (body clock) and shift work.
Research Ethics Approval
UP Manila Research Ethics Board (Panel 1)

1 Action letter per Continuing Review Report, August 2015 

Continued accrual of participants approved, valid until October 2016; no further action from the Ethics Panel


2 Action letter per Study Protocol Amendment Submission, March 2016, concerning the extended implementation of the chronotype survey this year across Metro Manila, Metro Angeles, Metro Cebu and Metro Davao

Protocol v. 18, reflecting amended timeline and budget, approved for use

NUHRA Details
NUHRA Regime NUHRA Classification NUHRA Priority
2010 - 2016 Health Technology Development Chronobiology
Project Duration
Start Date Duration in Months Target Completion Date Actual Completion Date
2014-10-27 24 2016-10-27 0000-00-00
Project Status


Implementing Agency (Primary Sponsor)

Name of Institution Classification Region LTO #
University of the Philippines Center for Integrative and Development Studies Government NCR
University of the Philippines - Manila, College of Public Health Public Higher Education Institution - State Universities and Colleges NCR

Cooperating Agency (Secondary Sponsor)

Name of Institution Classification Region LTO #
Ludwig Maximilian University Munich Private Higher Education Institution - Non Sectarian Germany

Funding Agency (Sources of Monetary or Material Support)

1. University of the Philippines Center for Integrative and Development Studies
2. Philippine Council for Health Research and Development, Department of Science and Technology

Contact for Public Queries

Name: Email Address: Phone Number: Postal Address:
Gayline F. Manalang Jr. +632-5247102 College of Public Health, University of the Philippines Manila, CPH Annex 1, 625 Pedro Gil St. Ermita 1000 Manila PH

Contact for Scientific Queries

Name: Email Address: Phone Number: Postal Address:
Gayline F. Manalang Jr. +632-5247102 College of Public Health, University of the Philippines Manila, CPH Annex 1, 625 Pedro Gil St. Ermita 1000 Manila PH

Investigating Team

Name Expertise Affiliation
Gayline F. Manalang Jr. human chronobiology, occupational health, public health, physical therapy University of the Philippines - Manila, College of Public Health

Health Condition(s) or Problem(s) Studied

The objective of the entire PhilSHIFT research program is to study the chronotype in the Filipino population as it may be influenced by certain characteristics and shift work in contact centers.
Project 1 (Philippine Chronotype and Social Jetlag Survey) concerns the chronotype of non-shift working and shift working Filipinos. It aims to:
1. determine the distribution of chronotypes among Filipino non-shift workers using the Philippine Munich Chronotype Questionnaire (PhilMCTQ) in key areas of the Philippines with the most contact center workers

2. extrapolate the chronotype distribution of Filipino shift workers in contact centers using the chronotype distribution of non-shift workers in the same areas

3. determine how the distribution of chronotypes may be influenced by age, sex, and subjective report of outdoor light exposure

4. develop the Philippine Munich Chronotype Questionnaire version for shift workers (PhilMCTQ-Shift) for use in research concerning shift workers in Philippine establishments, particularly contact centers

5. The Filipino chronotype (body clock type), its distribution in the Philippine population, influence of certain characteristics (age, sex, and outdoor light exposure) on chronotype distribution, and relationship with health factors (sleep, BMI, stimulant consumption, etc.)

Primary Outcomes

This project aims to elicit knowledge on the distribution of chronotypes of Filipinos and how this is influenced by age, sex and amount of time spent outdoors. The database will thereby serve as a reference point for all future studies in the Philippines. The study will also develop the Philippine Munich Chronotype Questionnaire for Shift Workers (PhilMCTQ-Shift), which is intended for a succeeding project on the chronotype and shift workers in contact centers.

Taking into account past project activities and outcomes, the following are the feasible outputs of Project 1 this 2016:
1. chronotype distribution among non-shift workers surveyed in the target metro cities of Metro Manila, Metro Cebu, Metro Clark and Metro Davao (where sufficient respondents numbers would allow)

2. data on age, sex, and outdoor light exposure (factors that may influence the chronotype distribution)

3. a chronotype questionnaire for shift workers in the contact center industry, PhilMCTQ-Shift, which would be subjected to validation in a future study

4. paper-based Filipino versions of the PhilMCTQ and PhilMCTQ-Shift

5. a documentation of promotional efforts for the PhilMCTQ survey, which may be reported for the benefit of researchers interested in epidemiologic studies of the human chronotype

Key Secondary Outcomes


Date of First Enrollment


Recruitment Status


Countries of Recruitment


Research Classification

Non-clinical Studies

Project Location & Institutional Ethics Review Board Which Approved the Study


FDA Document Tracking Number


FDA / ERC Approval Date


Amendment Approval Dates/Reasons


Key Inclusion and Exclusion Criteria (CT)


Study Type


Method of Allocation


Masking / Blinding


Masking Details








Target Sample Size (Philippines)

Actual Sample Size (Philippines)

Date of first enrollment


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Research Utilization

Type of Research Utilization Utilization Information

Oxford Sleep Medicine and Chronobiology Summer School 2016

24-29 July 2016, Oxford University
Oxford, United Kingdom

Sapporo Symposium on Biological Rhythms - 
30th Anniversary Meeting

25-27 July 2014, Hokkaido University 

Sapporo, Japan

Oral Presentation

Chronotype and social jetlag among Filipinos - an analysis of data from the Philippine Chronotype and Social Jetlag Survey. (Short communication)
XIV European Biological Rhythms Society Congress/IV World Congress on Chronobiology, 02-06 August 2015, University of Manchester
Manchester, United Kingdom

Gabud RS, Manalang GF Jr., Chua RBL, Mendoza ER, and Lozano-Kühne JP. “An assessment of chronotype and social jetlag among Filipinos.” International Journal of Philippine Science and Technology. Vol. 01, No. 1 (2015)