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Reference group for joint-DBs high trajectory groups: Children following a low or moderate trajectory for all DBs (% sample; Girls, Boys). From 1½ to 5 years, the mean of the reference class ranged from −0.20 to −0.33 (average: −0.29) for HI, from −0.16 to −0.33 (average: −0.28) for NC, and from −0.23 to −0.28 (average: −0.31) for PA.
