TABLE IV. _The incidence of influenza in families of different sizes._ (Influence of size of family). ═══════════╤═══════════╤═══════════╤═══════════════════════════════════ │ │ Total No. │ No. of │ │ of │ individuals│No. of such│individuals│ Number of these individuals who in family. │ families. │included in│ developed influenza. │ │ all such │ │ │ families. │ ───────────┼───────────┼───────────┼───────────┬───────────┬─────────── „ │ „ │ „ │ 1918. │ 1920. │ Total. ───────────┼───────────┼───────────┼─────┬─────┼─────┬─────┼─────┬───── „ │ „ │ „ │ No. │ Per │ No. │ Per │ No. │ Per │ │ │ │cent.│ │cent.│ │cent. ───────────┼───────────┼───────────┼─────┼─────┼─────┼─────┼─────┼───── 1│ 39│ 39│ 7│17.95│ 3│ 7.69│ 10│24.42 2│ 260│ 520│ 96│18.46│ 55│10.58│ 151│29.04 3│ 359│ 1077│ 215│19.96│ 128│11.88│ 343│31.85 4│ 396│ 1584│ 319│20.10│ 169│10.67│ 488│30.81 5│ 375│ 1875│ 423│22.56│ 203│10.83│ 626│33.39 6│ 264│ 1584│ 361│22.79│ 151│ 9.53│ 512│32.32 7│ 179│ 1253│ 279│22.27│ 109│ 8.70│ 388│30.96 8│ 103│ 824│ 156│18.93│ 55│ 6.67│ 211│25.61 9│ 57│ 513│ 85│16.57│ 21│ 4.09│ 106│20.66 10│ 28│ 280│ 40│14.14│ 26│ 9.29│ 66│23.57 11│ 15│ 165│ 10│ 6.06│ 7│ 4.24│ 17│10.30 12│ 4│ 48│ 0│ 0.0│ 5│10.42│ 5│10.42 13│ 2│ 26│ 5│19.23│ 3│11.54│ 8│30.77 14│ 1│ 14│ 0│ 0.0│ 0│ 0.0│ 0│ 0.0 ───────────┴───────────┴───────────┴─────┴─────┴─────┴─────┴─────┴───── In 1920, 9.55 per cent. of the entire canvassed population contracted the disease. The table shows that 7.69 per cent. of all individuals in families of one contracted influenza, and between 10 and 12 per cent. in families of from two to five individuals. Above the family of five the incidence rates again are lower and varying within wide limits. The last column shows the percentage of individuals by size of family contracting the disease in either or both epidemics. The average size of all families was 4.7 individuals.