Sex;Social class;Average number;Total BOTH SEXES;Total;Average;6.66 BOTH SEXES;Total;Standard deviation;4.92 BOTH SEXES;I;Average;5.70 BOTH SEXES;I;Standard deviation;4.76 BOTH SEXES;II;Average;6.25 BOTH SEXES;II;Standard deviation;4.84 BOTH SEXES;III;Average;6.19 BOTH SEXES;III;Standard deviation;4.83 BOTH SEXES;IV;Average;6.52 BOTH SEXES;IV;Standard deviation;4.89 BOTH SEXES;V;Average;7.17 BOTH SEXES;V;Standard deviation;4.99 BOTH SEXES;VI;Average;6.87 BOTH SEXES;VI;Standard deviation;4.97 BOTH SEXES;No data recorded;Average;6.98 BOTH SEXES;No data recorded;Standard deviation;4.56 MALES;Total;Average;6.58 MALES;Total;Standard deviation;4.94 MALES;I;Average;5.35 MALES;I;Standard deviation;4.18 MALES;II;Average;5.55 MALES;II;Standard deviation;4.70 MALES;III;Average;6.20 MALES;III;Standard deviation;4.74 MALES;IV;Average;7.14 MALES;IV;Standard deviation;5.21 MALES;V;Average;7.17 MALES;V;Standard deviation;5.11 MALES;VI;Average;6.50 MALES;VI;Standard deviation;4.85 MALES;No data recorded;Average;5.47 MALES;No data recorded;Standard deviation;3.64 FEMALES;Total;Average;6.71 FEMALES;Total;Standard deviation;4.91 FEMALES;I;Average;5.94 FEMALES;I;Standard deviation;5.11 FEMALES;II;Average;6.72 FEMALES;II;Standard deviation;4.88 FEMALES;III;Average;6.19 FEMALES;III;Standard deviation;4.87 FEMALES;IV;Average;5.98 FEMALES;IV;Standard deviation;4.51 FEMALES;V;Average;7.17 FEMALES;V;Standard deviation;4.90 FEMALES;VI;Average;7.04 FEMALES;VI;Standard deviation;5.01 FEMALES;No data recorded;Average;7.57 FEMALES;No data recorded;Standard deviation;4.75