莽人生活在云南省金平县。2023年，研究组赴金平县测量了91例莽人成年人（男性39例，女性52例）的51项体质指标值，计算了31项体质指数。研究结果如下：与2006年相比，2023年莽人男女的体质量、肩宽和骨盆宽等10项指标增大，男女的身高坐高指数、身高体重指数等12项指数增大，以上指标与指数差异均具有统计学意义。因为国家的持续扶持，莽人的社会经济生活水平迅速提高，其身体的体质量、宽度与围度值在这17年里出现明显增长。社会经济因素是莽人的体质量、身体宽度与围度增长的关键因素，而遗传和环境因素是影响身高和头面部指标的主要因素。莽人与布朗族的鼻高、上唇皮肤部高、平静胸围、臀围、大腿围、体质量之间的差异无统计学意义。莽人与布朗族男女均为阔面型。莽人的文化和生物特征与布朗族较近，识别为布朗族是合理的。

The Mang people live in Jinping County, Yunnan Province. In 2006, a research team conducted an investigation on adult Mang people in Jinping. In 2023, the research team revisited Jinping and investigated 51 physical parameters of 91 adults (39 males and 52 females) of the Mang ethnic group, and calculated 31 physical indexes. The results are as follows:
In 2023, compared with 2006, the body mass, shoulder breadth, crista iliaca breadth, chest circumference, biceps circumference, maximum biceps circumference, maximum forearm circumference, hip circumference, thigh circumference, and head circumference of both male and female Mang people increased. For both genders, the stature - sitting height index, stature - weight index, stature - chest circumference index, stature - shoulder breadth index, stature - crista iliaca index, BMI, Erismann’s index, Vervaeck’s index, Rohrer’s index, Broca’s index, Livi’s weight - height index, and Pelidisi’s index increased. The differences in the above - mentioned parameters and indexes were statistically significant.
Due to the continuous support of the government for the Mang people, their social and economic living standards have improved rapidly. As a result, their body mass, width, and circumference characteristics have increased significantly over the past 17 years. The body size of the Mang people has changed from the middle - chest and medium - crista iliaca type to the wide - chest and wide - crista iliaca type. Their body enrichment and nutritional status have improved, body tissue density has increased, and cardiopulmonary and respiratory functions have been enhanced. The development level of shoulder and pelvic organs has also been enhanced.
Compared with 2006, the stature, head breadth, mouth breadth, physiognomic facial height, bigonial breadth, interocular breadth, auricular height, and physiognomic ear breadth of the Mang people had little change. However, in 2023, the minimum frontal breadth, face breadth, external binocular breadth, morphological facial height, and nasal height decreased, while the nose breadth, lip height, physiognomic ear length, and upper lip height increased.
Socio-economic factors were the key factors for the increase in body mass, body width, and circumference during the 17-year period, while genetic and environmental factors were the main factors affecting stature, head, and facial parameters.
The Mang and Blang ethnic groups belong to the ancient Mon-Khmer-speaking ethnic groups in Yunnan. They share nearly identical historical records and legends with the Blang. No statistically significant differences in nasal height, upper lip height, body mass, chest circumference, hip circumference, thigh circumference, morphological facial index, stature-weight index, stature-chest circumference index, and BMI were observed between the Blang and Mang, whether in males or females. Both male and female Mang and Blang people have euryprosopy. The cultural and biological characteristics of the Mang are relatively close to those of the Blang. Therefore, it is reasonable to classify them as a subgroup of the Blang.