BS ISO 7250-3:2015 Basic human body measurements for technological design Part 3: Worldwide and regional design ranges for use in product standards

BS ISO 7250-3:2015 pdf free.Basic human body measurements for technological design Part 3: Worldwide and regional design ranges for use in product standards.
Design ranges presented in this part of ISO 7250 are directly related to ISO/TR 7250-2.
Design ranges are specified as smallest to largest 1st to 99th and 5th to 95th percentile value observed in national populations. Each percentile value in a design range comes from a single member body. Typically, product design requirements specify a smallest to largest range of values to be accommodated. However, some product standards specify medium size or midrange values, so midrange estimates are also provided here.
The worldwide ranges specified in this part of ISO 7250 are normative for product standards. However, some users of this part of 7250 may be developing products designed for a more focused, regional market. For this reason, a method is presented for creating regional design ranges from individual member body data presented in ISO/TR 7250-2. Examples of this process are shown in informative Annex A. For the anthropometric data used in deriving regional and worldwide ranges, the procedure and information for acquiring these data directly follow from the process described in ISO/TR 7250-2. The process of specifying design ranges defined in this part of ISO 7250 starts from the individual member body data presented in ISO/TR 7250-2.
Similarly, for many applications, user accommodation is maximized by considering male and female design dimensions separately. For example, maximum accommodation would be achieved by designing to a range that extends from the smallest 5th percentile value, male or female, to the largest 95th percentile value, male or female. Annex B shows the results of this procedure and should be used when the largest accommodation range is desired.
4 Procedures for establishing design ranges
4.1 Worldwide ranges
Anthropometric data are collected in many countries in the world. These anthropometric surveys vary markedly in quality, frequency, methodology, and purpose. In order to produce normative design ranges, it is critical to use anthropometric data that meet only the highest standards of representativeness and reliability. In addition, ISO standards are fundamentally a service for ISO member bodies. Therefore, the worldwide ranges presented in this part of ISO 7250 are derived from national populations of ISO member bodies presented in ISO/TR 7250-2. ISO/TR 7250-2 data are known to be consistent with ISO 7250-1 measurement definitions and protocols and ISO 15535 anthropometric database methods, and ISO/TR 7250-2 statistics have been reviewed and checked with member bodies for accuracy and reliability.
For some anthropometric dimensions, the population distribution is bi-modal by sex. This means that the male mean and female mean are separated. While the male and female distributions overlap, there are significant portions of the combined distribution that are totally male or totally female. Using a “total” 5th percentile value, therefore, may exclude S % of the total population but it may exclude 30 % of the female population. The effect is magnified when the sex distributions of the populations are significantly unequal, for example, in a military population which might be overwhelmingly male or In a nursing population which might be overwhelmingly female. When specific work forces are differentially male or differentially female, the “total” statistics may be significantly unrepresentative of a particular work force even if they accurately represent the national population. Using a pooled male-female population, PS and P95 values for design for these situations will result in unequal burdens of disaccommodation between the sexes. In such cases, using separated male and female design values comes closer to achieving gender-parity in the final design.
The design ranges in Clause 5 contain male values, female values and “total” values. The sample sizes are listed so it is clear that different numbers of males and females were measured in the anthropometric surveys that are found in ISO/TR 7250-2. The sex ratios in the sample may or may not represent the sex ratios in the working age population of the member bodies contributing data. Using “total” statistics as design values may be justified in certain specific cases but in general, male and female design values should be used separately in product or workspace design in order to ensure that both men and women are equally accommodated.
In Clause 5. the worldwide P1 value represents the smallest 1st percentile observed among all the member bodies with data presented in ISO/TR 7250-2. The worldwide PS value represents the smallest 5th percentile observed among all the member bodies with data presented in ISO/TR 7250-2. The worldwide P95 value represents the largest 95th percentile observed among all the member bodies with data presented in ISO/TR 7250-2. The worldwide P99 value represents the largest 99th percentile observed among all the member bodies with data presented in ISO/TR 7250-2. Thus, the values in the tables are based on particular surveys and only provide estimates for particular populations. The statistical confidence in the more extreme percentiles, e.g. P1 and P99, is much lower than it is for percentiles closer to the mean.
In some cases, the smallest or largest percentile values in ISO/TR 7250-2 have been identified as either unusual or derived from body scan data not validated in accordance with ISO 20685. In such cases, a more reliable value may be chosen to set the worldwide design limit.
The midrange estimates in this part of ISO 7250 are calculated as the midpoints of the interval between the worldwide PS and P95 estimates. The user is cautioned that these midrange estimates, while centrally located between the PS and P95 estimates, are not equivalent to statistical medians. They may not represent medium-sized males or females in any particular population.
4.2 Regional ranges
Regional design ranges illustrated in Annex A are informative in nature. In general, regional ranges are derived from only the member body data presented in ISO/TR 7250-2. In the case of defining regional ranges for the European region, existing published CEN standards were used as a starting point and where individual European member body data in ISO/TR 7250-2 exceed the published CEN standard ranges, lSO/TR 7250-2 limits were used to form the new European regional ranges.
The regional P1 value represents the smallest 1st percentile observed among all the member bodies with data presented in ISO/TR 7250-2. The regional PS value represents the smallest 5th percentile observed among all the member bodies with data presented in ISO/TR 7250-2. The regional P95 value represents the largest 95th percentile observed among all the member bodies with data presented in ISO/TR 7250-2. The regional P99 value represents the largest 99th percentile observed among all the member bodies with data presented in ISO/TR 7250-2.BS ISO 7250-3 pdf free download.BS ISO 7250-3:2015 Basic human body measurements for technological design Part 3: Worldwide and regional design ranges for use in product standards