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Longitudinal Patterns of Stages of Change for Exercise and Lifestyle Intervention Outcomes: An Application of Latent Class Analysis with Distal Outcomes

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Abstract

Stages of change measure an individual’s readiness to alter a health behavior. This study examined the latent longitudinal patterns of stages of change (SoC) for regular exercise over time among individuals participating in a lifestyle intervention project. It also investigated the association between the longitudinal patterns of SoC and intervention outcomes using a new statistical method to assess the relationship between latent class membership and distal outcomes. We analyzed data from the Special Diabetes Program for Indians Diabetes Prevention Program, a lifestyle intervention program to prevent diabetes among American Indians and Alaska Natives. Latent class analysis (LCA) was conducted to identify the longitudinal patterns of SoC for regular exercise reported at three time points. LCA with distal outcomes was performed to investigate the associations between latent class membership and behavioral changes after the intervention. The parameters and standard errors of the LCA with distal outcomes models were estimated using an improved three-step approach. Three latent classes were identified: Pre-action, Transition, and Maintenance classes. The Transition class, where stage progression occurred, had the greatest improvements in physical activity and weight outcomes at both time points post-baseline among female participants. It also had the largest improvements in weight outcomes among male participants. Furthermore, the Pre-action class had more attenuation in the improvements they had achieved initially than the other two classes. These findings suggest the potential importance of motivating participants to modify their readiness for behavioral change in future lifestyle interventions.

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Acknowledgments

The authors would like to express our gratitude to the Indian Health Service (IHS) as well as all tribal and urban Indian health programs and participants involved in the Special Diabetes Program for Indians Diabetes Prevention Program.

Compliance with Ethical Standards

Funding

Funding for SDPI-DP project was provided by the Indian Health Service (HHSI242200400049C, S. Manson). Manuscript preparation was supported in part by American Diabetes Association (ADA #7-12-CT-36, L. Jiang) and the National Institute of Diabetes and Digestive and Kidney Diseases (1P30DK092923, S.M. Manson).

Conflicts of Interest

The authors claim no conflict of interest.

Ethical Approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The SDPI-DP protocol was approved by the institutional review board (IRB) of the University of Colorado Denver and the IHS IRB. When required, grantees obtained approval from other entities charged with overseeing research in their programs (e.g., tribal review boards).

Informed Consent

All participants provided written informed consent and Health Insurance Portability and Accountability Act authorization.

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Correspondence to Luohua Jiang.

Additional information

Grant programs participating in the Special Diabetes Program for Indians Diabetes Prevention Demonstration Project: Confederated Tribes of the Chehalis Reservation, Cherokee Nation, Cheyenne River Sioux Tribe, the Chickasaw Nation, Coeur d’Alene Tribe, Colorado River Indian Tribes, Colville Confederated Tribes, Cow Creek Band of Umpqua Tribe, Fond du Lac Reservation, Gila River Health Care, Haskell Health Center, Ho-Chunk Nation, Indian Health Board of Minneapolis, Urban Native Diabetes Prevention Consortium, Kenaitze Indian Tribe IRA, Lawton IHS Service Unit, Menominee Indian Tribe of Wisconsin, Mississippi Band of Choctaw Indians, Norton Sound Health Corporation, Pine Ridge IHS Service Unit, Pueblo of San Felipe, Quinault Indian Nation, Rapid City IHS Diabetes Program, Red Lake Comprehensive Health Services, Rocky Boy Health Board, Seneca Nation of Indians, Sonoma County Indian Health Project, South East Alaska Regional Health Consortium, Southcentral Foundation, Trenton Indian Service Area, Tuba City Regional Health Care Corporation, United American Indian Involvement, Inc., United Indian Health Services, Inc., Warm Springs Health & Wellness Center, Winnebago Tribe of Nebraska, Zuni Pueblo.

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Appendix 1

Baseline characteristics and SoC distributions among SDPI-DP participants (DOCX 32 kb)

Appendix 2

Baseline characteristics among SDPI-DP participants by latent class membership (DOCX 29 kb)

Appendix 3

Associations between latent class membership and changes in intervention outcomes among SDPI-DP participants (Parameters estimated using classical three-step approach) (DOCX 31 kb)

Appendix 4

Associations between latent class membership and changes in intervention outcomes among SDPI-DP participants (Parameters estimated using model-based approach) (DOCX 33 kb)

Appendix 5

The expected value of the SoC variable at each time point for each latent class with changes in aerobic RAPA (Rapid Assessment of Physical Activity) from baseline to post-curriculum assessment as a distal outcome, using model-based approach. (Expected value is calculated as the sum of the product of stage of change variable and its corresponding item-specific probability for each latent class at each time point.) (DOCX 88 kb)

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Jiang, L., Chen, S., Zhang, B. et al. Longitudinal Patterns of Stages of Change for Exercise and Lifestyle Intervention Outcomes: An Application of Latent Class Analysis with Distal Outcomes. Prev Sci 17, 398–409 (2016). https://doi.org/10.1007/s11121-015-0599-y

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