Comparative study of body shape, body composition and bone density of urban and rural primary school students in Handan

Objective To understand the current situation and differences of body shape,body composition and bone mineral density in urban and rural primary school students,and to provide references for instructing them to have a rational diet.Methods Body composition and bone mineral density were measured by Body Composition Test Instrument (DF830,Japan) and South Korea Osteopro ultrasound bone densitometer,the body circumference were measured with the height gauge and tape,etc.The objects included 916 primary school students aged 12 from Handan Experimental Primary School,Shuguang Primary School,and the three affliated primary schools,namely,Kongcun Primary School,Liucun Primary School and Pancun Primary School.Results In term of the morphological index,the average index of height(male:154.73 vs 150.31 cm;female:154.56 vs 151.17 cm),weight (malc:45.34 vs 42.08 kg;female:43.07 vs 40.80 kg) and chest circumference(male:74.18 vs 70.37 cm;female:73.04 vs 70.52 cm) of urban male and female students were significantly higher than those of rural students (P<0.01),waist circumference of urban female students was significandy lower than that of rural students (63.51 vs 65.28 cm,P<0.05),waist circumference of urban boys was slightly higher than that of rural students (66.85 vs 66.52 cm,P>0.05);In the term of the body composition index,protein (male:6.54 vs 5.07 kg;female:4.81 vs 3.57 kg),minerals(male:2.14 vs 1.32 kg;female:1.88 vs 1.19 kg),body fat(male:9.75 vs 8.05 kg;female:11.44 vs 10.09 kg),fat ratio(male:21.50% vs19.13%;female:26.56% vs 24.73%) of urban male and female students were significantly higher than those of rural students(P<0.01),water content(male:24.05 vs 26.46 kg;female:21.51 vs 23.78 kg),skeletal muscle(male:15.82 vs 17.48 kg;female:13.26 vs 15.37 kg),skeletal muscle ratio(male:34.89% vs 41.53%;female:30.78% vs 37.67%) were significantly lower(P<0.01);In the term of the bone density index,OI(male:54.17 vs 51.31;female:56.46 vs 52.81),SOS(male:1 374.51 vs 1 366.42 m/s;female:1 386.72 vs 1 371.13 m/s),Z values(male:1.48 vs 1.17;female:1.59 vs 1.16) of urban male and female students were significantly higher than those of rural students(P<0.01).Conclusion Compared with urban students,rural students are relatively slow in their growth and development.