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Male Urination in the Train

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Male Urination in the Train Male urination in the train Marian Loth, Johan Molenbroek [email protected];[email protected] Delft University of Technology Abstract This paper presents the results of a study about hygiene in train toilets. The central problem is that with the existing train toilet design and the different groups of users it is impossible to keep the train toilet clean. In a conventional train, it is especially difficult for men to urinate without spilling urine outside the bowl while standing. This, sometimes invisible spray of urine drops on the toilet seat, smells strongly and feels wet. Therefore women and men are reluctant to sit on the toilet seat. It also causes women to hover while urinating and as a consequence they add to the soiling of the seat. To break this negative spiral, the solution for experiencing better hygiene in a train toilet is to divide the train toilet into two separate modules: a urinal for men (standing) and a family seated toilet for others. Keywords Train toilet; hygiene; urinal; toilet seat; male urination; female urination. Introduction This paper is an introduction to the research project ‘Hygienic Train Toilet’, which started in January 2009 in cooperation with the Dutch Railways (NS). NL Agency provided funding for the first part of this project to support the research and development of a hygienic train toilet, which will enhance the comfort and attractiveness of the train [1, p.5-7]. The project encompasses the research and product development of toilets with a focus on the (un) hygienic experience of train toilets. Considering train toilets in the Netherlands, it is striking that only one single design is intended for a large diversity of users with different usage habits. All these users have one thing in common: they experience the train toilet as non-hygienic. Public toilets in general are not popular [2,3,4,5,6] and train toilets give rise to even more negative sentiments. Train travellers use the train toilet to fulfil two basic needs: urination and defecation [5]. They also want to visit the train toilet just to wash their hands and for other activities such as adjusting contact lenses, taking medication and changing baby nappies [2, 3, 6, 7, 8, 9,10]. All kinds of different postures are practiced in the train toilet. This study concentrates on the hygienic problems connected with the standing posture of male urination. The position of the toilet seat [11] makes it very vulnerable to soiling by men urinating in this position. Men need to aim their urine into a horizontal plane from a great vertical distance a, which is very difficult to achieve cleanly, especially in a shaking train, see Figure 1. Although urinals for men are already commonly used, they have not yet been used in trains. Figure 1: Standing male urination We conducted our investigation to determine the factors that cause spillage of male urine outside the bowl in trains. The main research questions for our investigation are: (1) Which aspects of the train toilet influence the experience of hygiene in a positive or negative way? (2) What do male train travellers do in train toilets? (3) What problems occur related to the design of the toilet? Research Methods For the ‘Hygienic Train Toilet’ project, we applied the following research techniques apart from the literature study: 1) the Dutch railways annual Omnibus survey, 2) an on-line questionnaire, 3) an anthropometric data survey and 4) observational research with particular focus on standing male urination. The results of these studies will be published in separate papers and ultimately published in a PhD thesis 1) Dutch Railways Omnibus yearly research survey: To get input for an extensive questionnaire, Dutch Railways gave us the opportunity to add two simple questions to the 9 questions in its survey. The main goal of this survey is to conduct a quick scan of a topic by asking simple and short questions to train travellers. 666 respondents, varying in age from 15-83, with a 50-50 percentage division in gender answered these two questions: (translated from Dutch): 1. How do you experience using train toilets? A: I’d rather avoid it than to make use of it, or B: For me it’s no problem to use the toilet in the train. 2. Could you explain your answer? If you can mention one thing that is dirty in the train toilet and one thing that is clean, what would that be? A: Dirty: B: Clean: 2) Questionnaire: Via Internet, 3960 commuters from the panel of the Dutch Railways were invited to fill in an extensive questionnaire with approximately 50 questions about their characteristics, habits and needs in train toilets or public toilets. 3) Anthropometric survey [12,13]: This survey provides data regarding the standing male urination position. 4) Observations [14]: Before participating in the observation, the participants signed a consent form to guarantee their privacy. The observations were executed in two steps: Step 1: The first was a general observation of about 30 train travellers (healthy adults and students). The test occurred in a moving train in a city-to-city return trip with a total duration of 3 hours. Step 2: The second observation was in a moving train city-to-city return trip with a duration of 30 minutes. Nine train travellers participated in the test and were divided into two groups. The first group consisted of 3 representatives of a special needs population: a stoma patient, a wheelchair user and a young child (a 5 year old girl). The second group consisted of 6 male adults who represented the male urination group. Results 1) Omnibus Survey: 1A: Approximately 80% of the 666 respondents avoid using the toilet in trains, see Figure 2. Most respondents state that the main reason to avoid toilets in trains is related to the hygiene of train toilets. Other less mentioned reasons are the movement (shaking) of the train, limited space and lack of toilet paper. The main reasons given by respondents for it not being a problem to use the train toilet (17%) is that they do not need to use the toilet itself and that they are satisfied with the availability of a toilet. Figure 2: Percentage of respondents (n=666) of the Omnibus Survey that avoids toilets in trains. The answers to the questions on the dirty and clean aspects of train toilets are presented in Table 1. Most respondents mentioned dirty aspects. Dirty aspects of train toilet Number % Clean aspects of train toilet Number % whole toilet 150 23 wash basin 59 9 toilet seat 104 16 toilet paper 25 4 toilet bowl 67 10 walls/ceiling 22 3 Floor 55 8 Cloths 19 3 Smell 46 7 Mirror 18 3 Table 1: Dirty and clean aspects of the train toilet 2) Questionnaire: 1267 people completed the full questionnaire, a response of 32%. Of these, 1058 respondents, (Table 2) indicated that they were frequent train travellers against 209 infrequent train travellers. Infrequent travellers use the train les than once a month. The latter group completed the questionnaire about public toilets. In this paper, we only discuss the questionnaire results that relate to urination in train toilets. The main reason given for using the train toilet is urination. Of the users of a train toilet, approximately 60% are male and 40% female. The majority of the men (75%) urinate in a standing position and 60% of the women urinate in a hovering position. Of those who refuse to sit on the toilet seat, 36% are male and 20% female. An interesting result of the survey is that 41% of the women say that they avoid the use of a train toilet by not drinking before travelling. Female Male Total number Dutch population (2010) 8.3 8.2 16.5 Source: www.cbs.nl [16] (million) (million) (million) Percentage % 51% 49% 100% Train Travelers (2007) 4.8 4.2 9 age 4+, Source: internal report (NS). (million) (million) (million) Percentage % 53% 47% 100% Panel Dutch Railways (2010) 545 513 1058 age 16+, frequent travellers Percentage % 52% 48% 100% Table 2: representativeness of participants Panel Dutch Railways, n=1058 [16] 3) Anthropometric data [12,13]: Within the male population who urinate in a standing position, the distance between the position where the urine leaves the body and the position where it arrives varies greatly. For instance, the variation in this distance ( Figure 1) is 50% between a tall male (P99) and a small male (P1) see Table 3. Mean Mean crotch P1 crotch height: P99 crotch height: stature height: Distance b Distance b (small Distance b (tall (Cm.) (mean), see male), see Figure 1. male), see Figure 1. Figure 1. Male Dutch traveller 181.70 b= 87.2 b =78 b = 96.4 (20-60 years) [12] a = 44 a = 35 a = 53 USA Fly PRSNL, 177.34 b =85.07 b = 75.6 b = 94.9 1967 [13] male a = 52 a= 33 a = 52 Table 3: Variation in distances (cm.) within the male population, urinating in standing position. [12,13]. Men need to target the urine into the bowl from a great distance (Figure 1, distance a), which is a difficult task. This distance (Figure 1, distance a) also causes a back-splash of the urine [2, p.148-151] amongst other negative factors. These negative factors, such as bad sight of the task, shaking the last drops, ‘spread’ of the urine stream, an unpredictable ‘spray’, nonchalance, back splash etc. also cause spillage of urine outside the bowl. These factors are not included in this paper and will be published later in a separate paper.
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