Table 1.

Distribution of Ae. albopictus and Ae. aegypti from positive containers found in Penang Island.

Survey	Species	Ae. aegypti (A)
			Presence	Absence	Total	ad – bc (−ve/+ve)	χ2
All sites (4 study areas combined)	Ae. albopictus (B)	Presence	57 a	106 b	163	−ve	χ2 = 558.52*
		Absence	1343 c	61 d	1404
		Total	1400	167	1567
Pantai Jerjak	Ae. albopictus	Presence	15	37	52	−ve	χ2 = 147.97*
		Absence	236	8	244
		Total	251	45	296
Bayan Lepas	Ae. albopictus	Presence	19	33	52	−ve	χ2 = 151.29*
		Absence	323	12	335
		Total	342	45	387
Batu Maung	Ae. albopictus	Presence	21	30	51	−ve	χ2 = 122.48*
		Absence	322	15	337
		Total	343	45	388
Balik Pulau	Ae. albopictus	Presence	2	6	8	−ve	χ2 = 52.29*
		Absence	462	26	488
		Total	464	32	496

Note: ^*significant, p < 0.05, Where, a = the presence of both species (A and B) in shared containers, b = the presence of species A but species B absent, c = the presence of species B but species A absent, d = samples of other Aedes species but species A and B absent, bc = single containers for both species, ad = both species in shared containers and negative containers, positive association when ad-bc = +ve, negative association/repulsion when ad-bc = −ve