[1] Teixeira-Lemos E, Nunes S, Teixeira F, Reis F. Regular physical exercise training assists in preventing type 2 diabetes development: focus on its antioxidant and anti-inflammatory properties. Cardiovasc Diabetol. 2011;10(1):12. https://doi.org/10.1186/1475-2840-10-12.
[2] Ness AR, Leary SD, Mattocks C, Blair SN, Reilly JJ, Wells J, et al. Objectively measured physical activity and fat mass in a large cohort of children. PLoS Med. 2007;4(3):e97.
[3] Ahn S, Fedewa AL. A meta-analysis of the relationship between children’s physical activity and mental health. J Pediatr Psychol. 2011;36(4):385-97.
[4] Brand S, Gerber M, Beck J, Hatzinger M, Pühse U, Holsboer-Trachsler E. High exercise levels are related to favorable sleep patterns and psychological functioning in adolescents: a comparison of athletes and controls. J Adolesc Health. 2010;46(2):133-41.
[5] Ekeland E, Heian F, Hagen KB. Can exercise improve self esteem in children and young people? A systematic review of randomised controlled trials. Br J Sports Med. 2005;39(11):792-8.
[6] Nelson MC, Neumark-Stzainer D, Hannan PJ, Sirard JR, Story M. Longitudinal and secular trends in physical activity and sedentary behavior during adolescence. Pediatrics. 2006;118(6):e1627-34.
[7] Nader PR, Bradley RH, Houts RM, McRitchie SL, O’Brien M. Moderate-to-vigorous physical activity from ages 9 to 15 years. JAMA. 2008;300(3):295-305.
[8] Physical Activity Guidelines Advisory Committee. Physical activity guidelines advisory committee scientific report. Washington, DC: US Department of Health and Human Services. 2018.
[9] Kann L, McManus T, Harris WA, Shanklin SL, Flint KH, Queen B, et al. Youth risk behavior surveillance—United States, 2017. MMWR Surveillance Summaries. 2018;67(8):Supplementary Table 207..
[10] Janz NK, Becker MH. The Health Belief Model: a decade later. Health Educ Q. 1984;11(1):1-47.
[11] Sallis JF, Prochaska JJ, Taylor WC. A review of correlates of physical activity of children and adolescents. Med Sci Sports Exerc. 2000;32(5):963-75.
[12] Craggs C, Corder K, Van Sluijs EM, Griffin SJ. Determinants of change in physical activity in children and adolescents: a systematic review. Am J Prev Med. 2011;40(6):645-58.
[13] Van KDH, Paw MJ, Twisk JW, Van WM. A brief review on correlates of physical activity and sedentariness in youth. Med Sci Sports Exerc. 2007;39(8):1241-50.
[14] Bauman AE, Reis RS, Sallis JF, Wells JC, Loos RJ, Martin BW, et al. Correlates of physical activity: why are some people physically active and others not? The Lancet. 2012;380(9838):258-71.
[15] Allison KR, Dwyer JJ, Makin S. Self-efficacy and participation in vigorous physical activity by high school students. Health Education & Behavior. 1999;26(1):12-24.
[16] Allison KR, Dwyer JJ, Makin S. Perceived barriers to physical activity among high school students. Prev Med. 1999;28(6):608-15.
[17] Sallis JF, Prochaska JJ, Taylor WC, Hill JO, Geraci JC. Correlates of physical activity in a national sample of girls and boys in grades 4 through 12. Health Psychol. 1999;18(4):410-415.
[18] Zakarian JM, Hovell MF, Hofstetter CR, Sallis JF, Keating KJ. Correlates of vigorous exercise in a predominantly low SES and minority high school population. Prev Med. 1994;23(3):314-21.
[19] Tappe MK, Duda JL, Ehrnwald PM. Perceived barriers to exercise among adolescents. J Sch Health. 1989;59(4):153-5.
[20] Neumark-Sztainer D, Story M, Hannan PJ, Tharp T, Rex J. Factors associated with changes in physical activity: a cohort study of inactive adolescent girls. Arch Pediatr Adolesc Med. 2003;157(8):803-10.
[21] Stalsberg R, Pedersen AV. Effects of socioeconomic status on the physical activity in adolescents: a systematic review of the evidence. Scand J Med Sci Sports. 2010;20(3):368-83.
[22] Landis JR, Koch GG. The measurement of observer agreement for categorical data. Biometrics. 1977:159-74.
[23] Kohl III HW, Fulton JE, Caspersen CJ. Assessment of physical activity among children and adolescents: a review and synthesis. Prev Med. 2000;31(2):S54-76.
[24] McGraw KO, Wong SP. Forming inferences about some intraclass correlation coefficients. Psychol Methods. 1996;1(1):30-46.
[25] Field A. Discovering statistics using IBM SPSS statistics. Thousand Oaks, CA: Sage Publications Ltd; 2013.
[26] Watson JC. Establishing evidence for internal structure using exploratory factor analysis. Meas Eval Couns Dev. 2017;50(4):232-8.
[27] Tabachnick BG, Fidell LS, Ullman JB. Using multivariate statistics. Boston: Pearson; 2007.
[28] O'Rourke N, Psych R, Hatcher L. A step-by-step approach to using SAS for factor analysis and structural equation modeling. Cary, NC: SAS Institute; 2013.
[29] Velicer WF, Fava JL. Affects of variable and subject sampling on factor pattern recovery. Psychol Methods. 1998;3(2):231-251.
[30] Velicer WF, Eaton CA, Fava JL. Construct explication through factor or component analysis: A review and evaluation of alternative procedures for determining the number of factors or components. Problems and solutions in human assessment: Honoring Douglas N. Jackson at seventy. Boston: Kluwer; 2000, p. 41-71.
[31] O’Connor BP. SPSS and SAS programs for determining the number of components using parallel analysis and Velicer’s MAP test. Behavior Research Methods, Instruments, & Computers. 2000;32(3):396-402.
[32] Suhr DD. Exploratory or confirmatory factor analysis. SAS Users Group International Conference (pp. 1-17). Cary: SAS Institute, Inc. 2006.
[33] Hu L, Bentler PM. Cutoff criteria for fit indexes in covariance structure analysis: Conventional criteria versus new alternatives. Struct Equ Modeling. 1999;6(1):1-55.
[34] Tabachnick BG, Fidell LS, Ullman JB. Using multivariate statistics. Boston: Pearson; 2007.
[35] Kowalski KC, Crocker PRE, Kowalski NP. Convergent validity of the Physical Activity Questionnaire for Adolescents. Pediatric Exercise Science. 1997;9(4):342-52; doi:10.1123/pes.9.4.342.
[36] Janz KF, Lutuchy EM, Wenthe P, Levy SM. Measuring activity in children and adolescents using self-report: PAQ-C and PAQ-A. Med Sci Sports Exerc. 2008;40(4):767-72; doi:10.1249/MSS.0b013e3181620ed1.
[37] Biddle SJ, Whitehead SH, O’Donovan TM, Nevill ME. Correlates of participation in physical activity for adolescent girls: a systematic review of recent literature. Journal of Physical Activity and Health. 2005;2(4):423-34.
[38] Kowalski KC, Crocker PR, Donen RM. The physical activity questionnaire for older children (PAQ-C) and adolescents (PAQ-A) manual. College of Kinesiology, University of Saskatchewan. 2004;87(1):1-38.
[39] Kaiser HF. An index of factorial simplicity. Psychometrika. 1974;39(1):31-6.
[40] Dwyer JJ, Allison KR, Goldenberg ER, Fein AJ, Yoshida KK, Boutilier MA. Adolescent girls' perceived barriers to participation in physical activity. Adolescence. 2006;41(161):75-90.
[41] Allison KR, Dwyer JJ, Goldenberg E, Fein A, Yoshida KK, Boutilier M. Male adolescents' reasons for participating in physical activity, barriers to participation, and suggestions for increasing participation. Adolescence. 2005;40(157):155-71.
[42] Kimm SY, Glynn NW, McMahon RP, Voorhees CC, Striegel-Moore RH, Daniels SR. Self-perceived barriers to activity participation among sedentary adolescent girls. Medicine & Science in Sports & Exercise. 2006;38(3):534-40.
[43] Taylor WC, Sallis JF, Dowda M, Freedson PS, Eason K, Pate RR. Activity patterns and correlates among youth: differences by weight status. Pediatric exercise science. 2002;14(4):418-31.
[44] Wickman ME, Anderson NLR, Greenberg CS. The adolescent perception of invincibility and its influence on teen acceptance of health promotion strategies. J Pediatr Nurs. 2008;23(6):460-8.
[45] Nunnally, Jum C., Bernstein,Ira H.,. Psychometric theory. New York: McGraw-Hill; 1994.
[46] Pender NJ. Health promotion model manual. http://deepblue.lib.umich.edu/bitstream/2027.42/85350/1/HEALTH_PROMOTION_MANUAL_Rev_5-2011.pdf, 2011. Accessed 2/14/20.
[47] Bandura A. Human agency in social cognitive theory. Am Psychol. 1989;44(9):1175-1184.
[48] Glanz K, Rimer BK, Viswanath K. Health behavior and health education: theory, research, and practice. San Francisco: John Wiley & Sons; 2008.