48It is for the national court, which alone has jurisdiction to assess the facts and to interpret the national legislation, to determine whether such a justification exists. It is necessary in that regard to ascertain, in light of all the relevant factors and taking into account the possibility of achieving by other means the aims pursued by the provisions in question, whether those aims appear to be unrelated to any discrimination on grounds of sex and whether those provisions, as a means to the achievement of certain aims, are capable of advancing those aims (see, to this effect, Rinner-Kühn, cited above, paragraph 15, and Steinicke, cited above, paragraph 58).
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