a Including 1 household not reporting number of rooms. b Less than 0.05 per cent. 4.62 .1 12.4 20.8 20.8 17.5 11.0 8.1 4.5 2.9 1.9 1.2 9.1 6-Continued AVERAGE NUMBER OF PERSONS PER APARTMENT, PER ROOM, By general nativity and race of head of household 6-Continued AVERAGE NUMBER OF PERSONS PER APARTMENT, PER ROOM, AND PER SLEEPING-ROOM-Continued OLD AND NEW IMMIGRATION COMPARED WITH RESPECT TO AVERAGE NUMBER OF PERSONS PER ROOM AND PER SLEEPING-ROOM AMONG THE FOREIGN 6-Continued NUMBER AND PER CENT. OF HOUSEHOLDS KEEPING BOARDERS OR LODGERS By general nativity and race of head of household [Information relating to boarders or lodgers covers only immediate time of |