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. 2017 Jul 18;7(7):e015386. doi: 10.1136/bmjopen-2016-015386

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Rate and adjusted relative risk of PTB with severe SGA—PTB–SGA—for live-born infants of East Asian-born mothers, stratified by age (upper two plots) and parity (lower two plots). Relative risks were adjusted for maternal age (<20, 20–34, ≥35 years), parity (0, 1, 2, 3, ≥4), marital status (married/common law, unmarried, unknown), residential income quintile (Q1 (lowest) to Q5 (highest), unknown), infant sex and twin birth. PTB, preterm birth; SGA, small for gestational age.