SEX;SOCIAL CLASS;INDICATOR;Total BOTH SEXES;Total;Mean;6.78 BOTH SEXES;Total;Standard deviation;14.24 BOTH SEXES;I;Mean;3.96 BOTH SEXES;I;Standard deviation;5.50 BOTH SEXES;II;Mean;9.29 BOTH SEXES;II;Standard deviation;25.60 BOTH SEXES;III;Mean;7.39 BOTH SEXES;III;Standard deviation;16.77 BOTH SEXES;IV;Mean;8.24 BOTH SEXES;IV;Standard deviation;17.20 BOTH SEXES;V;Mean;6.43 BOTH SEXES;V;Standard deviation;11.54 BOTH SEXES;VI;Mean;6.46 BOTH SEXES;VI;Standard deviation;8.87 BOTH SEXES;Not recorded;Mean;6.08 BOTH SEXES;Not recorded;Standard deviation;8.68 Men;Total;Mean;7.37 Men;Total;Standard deviation;16.03 Men;I;Mean;4.13 Men;I;Standard deviation;5.83 Men;II;Mean;7.75 Men;II;Standard deviation;20.89 Men;III;Mean;8.71 Men;III;Standard deviation;21.11 Men;IV;Mean;9.00 Men;IV;Standard deviation;19.67 Men;V;Mean;6.78 Men;V;Standard deviation;11.72 Men;VI;Mean;7.24 Men;VI;Standard deviation;10.83 Men;Not recorded;Mean;5.41 Men;Not recorded;Standard deviation;5.72 Women;Total;Mean;6.24 Women;Total;Standard deviation;12.31 Women;I;Mean;3.79 Women;I;Standard deviation;5.15 Women;II;Mean;10.76 Women;II;Standard deviation;29.32 Women;III;Mean;5.73 Women;III;Standard deviation;8.28 Women;IV;Mean;7.42 Women;IV;Standard deviation;13.96 Women;V;Mean;6.14 Women;V;Standard deviation;11.38 Women;VI;Mean;5.88 Women;VI;Standard deviation;7.02 Women;Not recorded;Mean;6.34 Women;Not recorded;Standard deviation;9.61