Philip A G
Acta Genet Med Gemellol (Roma). 1981;30(3):203-12. doi: 10.1017/s0001566000007662.
Sixteen pairs of term discordant twins (weight discrepancy of more than 20% when the lighter twin was compared to the heavier) were evaluated at birth. Weight, length, head circumference, anterior fontanel area, and combined ossification of the knee epiphyses were measured, and ponderal index (weight/length ratio) calculated. The most severely growth retarded infants had markedly decreased ossification and larger anterior fontanels. Eleven pairs had physical measurements at one year of age. With individual exceptions, the lighter twins at birth remained smaller in all dimensions. Despite these persistent differences between twin pairs, the values for length at one year of age were within normal limits for both the heavier and lighter twins. Infants without ossification at birth had a greater incremental linear growth by one year than those infants with ossification.
对16对足月不一致的双胞胎（体重较轻的双胞胎与较重的双胞胎相比，体重差异超过20%）在出生时进行了评估。测量了体重、身长、头围、前囟面积和膝关节骨骺的联合骨化情况，并计算了 ponderal 指数（体重/身长比）。生长发育严重迟缓的婴儿骨化明显减少，前囟较大。11对双胞胎在1岁时进行了体格测量。除个别情况外，出生时体重较轻的双胞胎在所有维度上仍然较小。尽管双胞胎之间存在这些持续的差异，但较重和较轻的双胞胎在1岁时的身长值均在正常范围内。出生时没有骨化的婴儿比有骨化的婴儿在1岁时线性生长增量更大。
