本文对兰州市3月—17周岁的儿童及青少年1320人，男660人，女660人进行了骨龄研究。

This paper studied the skeletal age of 1320 infants and adolescents of 3 months to 17 years (including 660 males, 660 females) in Lanzhou City.

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研究发现，女烟民每吸烟10年，骨矿物质密度就会降低2.3%―3.3%，骨质密度下降会导致骨折和骨质疏松症发病率大增。

Study found that female smokers smoke every 10 years, bone mineral density is reduced by 2.3%-3.3% fall in bone density leading to fractures and osteoporosis incidence rate rose significantly.

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方法 研究临床接受骨皮质切开术辅助治疗的正畸患者48例，男14例，女34例。

Methods 48 orthodontic patients were selected, 14 males and 34 females, and they all accepted corticotomy assisted orthodontic treatment.

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方法 研究临床接受骨皮质切开术辅助治疗的正畸患者48例，男14例，女34例。

Methods 48 orthodontic patients were selected, 14 males and 34 females, and they all accepted corticotomy assisted orthodontic treatment.

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