Primary care in the United States. Innovations in primary care in the United States.

activity recall questionnaire with a seven-day food intake and physical activity diary. Epidemiology 1991;2:296-9. 8 McHorney CA, Ware JE Jr, Raczek AE. The MOS 36-item short-form health survey (SF-36): II. Psychometric and clinical tests of validity in measuring physical and mental health constructs. Med Care 1993;31: 247-63. 9 Lee IM, Skerrett PJ. Physical activity and all-cause mortality: what is the dose-response relation? Med Sci Sports Exerc 2001;33(6 suppl):S459-71; discussion S493-4. 10 Halbert JA, Silagy CA, Finucane P, Withers RT, Hamdorf PA, Andrews GR. The effectiveness of exercise training in lowering blood pressure: a meta-analysis of randomised controlled trials of 4 weeks or longer. J Hum Hypertens 1997;11:641-9. 11 Cook NR,Cohen J,Hebert PR, Taylor JO,Hennekens CH. Implications of small reductions in diastolic blood pressure for primary prevention. Arch Intern Med 1995;155:701-9. 12 Effects of weight loss and sodium reduction intervention on blood pressure and hypertension incidence in overweight people with high-normal blood pressure. The Trials of Hypertension Prevention Collaborative Research Group. Arch Intern Med 1997;157:657-67. 13 Intercontinental Medical Statistics Health (NZ) Limited. Green prescriptions in general practice. Auckland: IMS NZ, 1999. 14 Harland J, White M, Drinkwater C, Chinn D, Farr L, Howel D. The Newcastle exercise project: a randomised controlled trial of methods to promote physical activity in primary care. BMJ 1999;319:828-32.