Those notches were measured in decibels (abbreviated as dB), which are a measure of sound intensity
For example, the questionnaires used for the various groups of participants did not solicit uniform sets of information about childhood smoking, a factor that may have affected the findings
Beyond Nicotine: Toxicological Insights Into Metals, Nanoparticles, and Flavoring Agents in ECigarette Aerosols Saba Beigh, Arshad Jawed, Sajad Ahmad Dar Journal of Applied Toxicology 26
[168] "Report of Committee on Tax Evasion," in Proceedings of the 41 st Annual Meeting of the National Tobacco Tax Association (Chicago: Federation of Tax Administrators, 1967), 14
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