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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: Thorax. 2018 Jun 13;73(11):1041–1048. doi: 10.1136/thoraxjnl-2017-211383

Figure 4:

Figure 4:

Dose-response of plasma cotinine and asthma control, from generalized additive models using penalized splines. Results presented comparing each of “not well controlled” and “very poorly controlled” to “controlled” asthma separately.