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. Author manuscript; available in PMC: 2018 Oct 23.
Published in final edited form as: Fertil Steril. 2014 Dec 10;103(2):388–395. doi: 10.1016/j.fertnstert.2014.10.048

FIGURE 1.

FIGURE 1

Restricted cubic spline regression assessing nonlinear adjusted relationship between male or female BMI and IVF outcome. Adjusted for male and female age, partner BMI, and parity. Dotted line=null relationship, relative risk=1; solid line: spline graph with 4 knot points, reference value is median male (A) and female (B) BMI; dashed line: 95% confidence interval.