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. Author manuscript; available in PMC: 2021 Jul 1.
Published in final edited form as: Stat Methods Med Res. 2019 Sep 23;29(7):1769–1786. doi: 10.1177/0962280219876963

Figure 2:

Figure 2:

Left: gestational-age-specific directional quantile envelopes (DQEs) of birthweight (BW) and head circumference (HC) for all girls at level p = 0.1. Right: DQEs of BW and HC at levels p = 0.1 and p = 0.005 for girls born at (23, 25] weeks of gestation. The dashed line marks the 90th percentile of the HC-to-BW ratio in the allometric direction.