Effect of dietary sodium on airways responsiveness and its importance in the epidemiology of asthma: an evaluation in three areas of northern England.

Godfrey RC. Asthma and IgE levels in rural and urban communities of The Gambia. Clin Allergy 1975;5:201-7.

Van Niekerk CH, Weinberg EG, Shore SC, De V Heese H, Van Schalkwyk DJ. Prevalence of asthma: a comparative study of urban and rural Xhosa children. Clin Allergy 1979;9:319-24.

Waite DA, Eyles EF, Tonkin SL, O'Donnell. Asthma prevalence in Tokelauan children in two environments. Clin Allergy 1980;10:71-5.

Gliebermann L. Blood pressure and dietary salt in human populations. Ecol Food Nutr 1973;2:143-56.

Burney PGJ. The causes of asthma - does salt potentiate bronchial reactivity? Discussion paper. J R Soc Med 1987; 80:364-7.

Burney PGJ, Britton JR, Chinn S, Tattersfield AE, Platt HS, Papacosta AO, Kelson MC. Response to inhaled histamine and 24 hour sodium excretion. BMJ 1986;292: 1483-6.

Britton JR, Pavord I, Richards K, Knox A, Wisniewski A, Weiss S, Tattersfield AE. Dietary sodium intake and the risk ofairway hyperreactivity in a random adult population. Thorax 1994;49:875-80.

Sparrow D, O'Connor GT, Rosner B, Weiss ST. Methacholine airway responsiveness and 24 hour urine excretion of sodium and potassium. Am Rev Respir Dis 1991; 144:722-5.

Javaid A, Cushley MJ, Bone MF. Effect of dietary salt on bronchial reactivity to histamine in asthma. BMJ 1988; 297:454.

Burney PGJ, Neild JE, Twort CHC, Chinn S, Jones TD, Mitchell WD, et al. Effect of changing dietary sodium on the airway response to histamine. 7horax 1989;44:36-41.

Carey OJ, Locke C, Cookson JB. Effect of alterations of dietary sodium on severity ofasthma in men. Thorax 1993; 48:714-8.

Lieberman D, Heimer D. Effect of dietary sodium on the severity of bronchial asthma. Thorax 1992;47:360-3.

Hendrick DJ, Beach JR, Avery AJ, Dennis JH, Bromly CL, Ward RJ, et al. An epidemiological investigation of asthma in apprentice (shipyard) welders. Report to the Medical Research Council and the Health & Safety Executive, 1994.

Beach JR, Young CL, Avery AJ, Stenton SC, Dennis JH, Walters EH, et al. Measurement of airway responsiveness to methacholine: relative importance of the precision of drug delivery and method of assessing response. Thorax 1993;48:239-43.

Hendrick DJ, Fabbri LM, Hughes JM, Banks DE, Barkman HW, Connolly MJ, et al. Modification of the methacholine inhalation test and its epidemiologic use in polyurethane workers. Am Rev Respir Dis 1986;133:600-4.

Dennis JH, Stenton SC, Beach JR, Avery AJ, Walters EH, Hendrick DJ. Jet and ultrasonic nebuliser output: use of a new method for direct measurement of aerosol output. Thorax 1990;45:705-10.

Cockcroft DW, Hurst TS, Gore BP. Importance of evaporative losses during standardised nebulized inhalation provocation tests. Chest 1989;96:505-8.

Stenton SC, Beach JR, Avery AJ, Hendrick DJ. The value of questionnaires and spirometry in asthma surveillance programmes in the workplace. Occup Med 1993;43:203-6.

Rijcken B, SchoutenJP. Measuring bronchial responsiveness in epidemiology. Eur RespirJ7 1993;6:617-8.

Amemiya T. Regression analysis when the dependent variable is truncated normal. Econometnica 1973;41:997-1016.

Burney PGJ, Britton JR, Chinn S, Tattersfield AE, Papacoasta AO, Kelson MC, et al. Descriptive epidemiology of bronchial reactivity in an adult population: results from a community study. Thorax 1987;42:38-44.

Britton J, Pavord I, Richards K, Knox A, Wisniewski A, Wahedna I, et al. Factors influencing the occurrence of airway hyperreactivity in the general population: the importance of atopy and airway calibre. EurRespirJ 1994; 7:881-7.

Bakke PS, Baste V, Gulsvik A. Bronchial responsiveness in a Norwegian community. Am Rev Respir Dis 1991;143: 317-22.

Gerrard JW, Cockcroft DW, Mink JT, Cotton DJ, Poonawala R, Dosman JA. Increased nonspecific bronchial reactivity in cigarette smokers with normal lung function. Am Rev Respir Dis 1989;122:577-81.

O'Connor G, Sparrow D, Segal MR, Weiss ST. Smoking, atopy, and methacholine airway responsiveness among middle-aged and elderly men. Am Rev Respir Dis 1989; 140:1520-6.

British Thoracic Association. Accuracy of death certificates in bronchial asthma. Thorax 1984;39:505-9.