Hellgren L
Berufsdermatosen. 1976 Jun;24(3):71-8.
Distributed on 66 occupational groups (and 170 individual occupations) the prevalence of lichen ruber planus within the groups was determined by examining nearly every person in the total populations of 39,418 persons in five different areas in Sweden. The prevalence of l.r.p. in the total population was 0.3 per cent for males and 0.1 per cent for females. When l.r.p. prevalences were compared between different occupational groups, disturbing influences from age differences between the groups were eliminated by the standard population method. The indices calculated by aid of computer were used for direct ranking of the occupational groups from those with the highest to those with the lowest prevalences. In 33 of the 66 occupational groups (and in 129 of 170 individual occupations) no l.r.p. was found. In 24 male and 6 female occupational groups an overaverage high prevalence of l.r.p. was found. In two occupational branches, i.e. agriculture and forestry work (male agricultural workers, farmers, gardeners, garden workers and forest workers) and engineering and building metal work (steel-workers, plate-workers, machine and engine repairers, machine and engine mechanics, engineering workers, plumbers, metal workers) an overaverage high prevalence of l.r.p. was found in nearly all occupational groups. The results indicate that l.r.p. is more prevalent in occupational groups, in which the work dirties the skin (with i.e. soil, oil, cement dust), while in occupational groups with "clean work" the disease was less prevalent. However, there were exceptions. 67.7% of the males, 55.5% of the females had their debute lesions on the lower legs; in 21% of the males and 22.2% of the females the l.r.p. lesions debuted on the wrists. These are areas liable to exposure for different chemical substances and trauma.
在瑞典五个不同地区的39418人的总人口中，对几乎每个人进行检查，以确定66个职业群体（以及170种个体职业）中扁平苔藓的患病率。男性扁平苔藓在总人口中的患病率为0.3%，女性为0.1%。在比较不同职业群体之间的扁平苔藓患病率时，采用标准人口法消除了群体间年龄差异的干扰影响。借助计算机计算的指数用于对职业群体从患病率最高到最低进行直接排名。在66个职业群体中的33个（以及170种个体职业中的129种）未发现扁平苔藓。在24个男性职业群体和6个女性职业群体中，发现扁平苔藓患病率高于平均水平。在两个职业分支中，即农业和林业工作（男性农业工人、农民、园丁、园艺工人和林业工人）以及工程和建筑金属工作（钢铁工人、板材工人、机器和发动机修理工、机器和发动机机械师、工程工人、水管工、金属工人），几乎所有职业群体中扁平苔藓患病率均高于平均水平。结果表明，扁平苔藓在皮肤易被弄脏（如土壤、油污、水泥粉尘）的职业群体中更为普遍，而在从事“清洁工作”的职业群体中该病则较少见。然而，也有例外情况。67.7%的男性、55.5%的女性初发病损位于小腿；21%的男性和22.2%的女性扁平苔藓病损初发于手腕。这些都是易接触不同化学物质和遭受创伤的部位。
