January 1989 results and measurements in the Archives of Disease in Childhood will be given in SI units only. Would contributors please ensure that all results in manuscripts, tables, and figures submitted from now on are in SI units; otherwise, publication may be delayed. Exceptions to this are: (a) Blood pressure in mm Hg; (b) Ventilation pressure in cm H2O; (c) Concentration of drugs; (d) Concentration of any substance where the molecular weight is not known accurately. No old units or conversion factors should be submitted in manuscripts: conversion is the responsibility solely of the author.
Letter: SI units and blood pressure.