Table 1.

Characteristics of the houses and residents in all 15 wards of the study area in Dar es Salaam, Tanzania, during the first three rounds of household surveys from May 2004 until May 2006

Characteristic	Frequency
	N	%
Houses	3073	100
Walls	3073	100
Stone, cement, fired or concrete bricks	1684	54.4
Unfired bricks, sand, wood	1355	43.7
Corrugated iron sheets, mud, grass	59	1.9
Grass thatch, cardboard	0	0
Roof	3073	100
Tiles, cement, reinforced concrete	193	6.3
Corrugated iron sheets, asbestos	2868	93.3
Thatch, sticks, mud, grass, plastic sheets	11	0.4
Ceiling board	3066	100
Whole house	829	27
Partly	554	18.1
None	1683	54.9
Screening	3057	100
Intact	684	22.4
With holes	1006	32.9
Incomplete	503	16.5
Glass windows	105	3.4
None	759	24.8
Residents	20289	100
Bednet coverage	20285	100
User	16883	83.2
Non-user	3402	16.8
Treatment status of net	16883	100
Treated in last 6 months	5194	30.8
Treated more than 6 months ago	66	0.4
Never treated	11623	68.8
Other protection against mosquitoes	20287	100
Coil	1245	6.1
Spray	2167	10.7
Repellent	307	1.5
None	16571	81.7
Usage of at least 1 protection measure	20289	100
Net, coil, spray, repellent	17437	85.9
None	2852	14.1