Sex;Social class;Average number;Total BOTH SEXES;Total;Average;17.19 BOTH SEXES;Total;Standard deviation;4.55 BOTH SEXES;I;Average;17.81 BOTH SEXES;I;Standard deviation;3.81 BOTH SEXES;II;Average;17.68 BOTH SEXES;II;Standard deviation;4.54 BOTH SEXES;III;Average;17.23 BOTH SEXES;III;Standard deviation;4.36 BOTH SEXES;IV;Average;16.95 BOTH SEXES;IV;Standard deviation;4.10 BOTH SEXES;V;Average;17.15 BOTH SEXES;V;Standard deviation;4.84 BOTH SEXES;VI;Average;16.96 BOTH SEXES;VI;Standard deviation;4.84 BOTH SEXES;No data recorded;Average;17.18 BOTH SEXES;No data recorded;Standard deviation;4.20 MALES;Total;Average;16.67 MALES;Total;Standard deviation;3.87 MALES;I;Average;17.59 MALES;I;Standard deviation;3.94 MALES;II;Average;17.02 MALES;II;Standard deviation;3.08 MALES;III;Average;16.74 MALES;III;Standard deviation;3.77 MALES;IV;Average;16.79 MALES;IV;Standard deviation;3.97 MALES;V;Average;16.38 MALES;V;Standard deviation;3.63 MALES;VI;Average;16.52 MALES;VI;Standard deviation;4.65 MALES;No data recorded;Average;16.57 MALES;No data recorded;Standard deviation;2.39 FEMALES;Total;Average;17.87 FEMALES;Total;Standard deviation;5.21 FEMALES;I;Average;18.08 FEMALES;I;Standard deviation;3.63 FEMALES;II;Average;18.33 FEMALES;II;Standard deviation;5.56 FEMALES;III;Average;17.72 FEMALES;III;Standard deviation;4.85 FEMALES;IV;Average;17.23 FEMALES;IV;Standard deviation;4.29 FEMALES;V;Average;18.19 FEMALES;V;Standard deviation;5.96 FEMALES;VI;Average;17.55 FEMALES;VI;Standard deviation;5.03 FEMALES;No data recorded;Average;17.67 FEMALES;No data recorded;Standard deviation;5.18