Demographics, Practising Arrangements, and Standards: Survey among New Zealand Dentists

Table 1

Proportional weight calculation with respect to New Zealand regions.

	Unweighted		Wp	Weighted
	Frequency	Percent		Frequency	Percent
Auckland	52	27.7	1.15	60	30.5
Bay of Plenty	14	7.4	0.85	12	6.1
Canterbury	21	11.2	1.22	26	13.1
Hawke’s Bay	10	5.3	0.62	6	3.2
Manawatu-Wanganui	9	4.8	1.14	10	5.2
Nelson-Tasman	8	4.3	0.78	6	3.2
Northland	8	4.3	0.68	5	2.8
Otago	17	9.0	1.01	17	8.8
Southland	4	2.1	0.71	3	1.4
Taranaki	6	3.2	0.75	5	2.3
Waikato	13	6.9	1.57	20	10.4
Wellington	26	13.8	1.0	26	13.1
Total	188	100	—	196	100.0

Wp = proportional weight; P_i = total number of dentists in a particular region or sample; P_total = total dentist population in New Zealand; R_i = total number of dentists returned and met the inclusion criteria for the region; R_total = total number of dentists returned and met the inclusion criteria in New Zealand. Wp > 1: sample under represented, Wp < 1: sample over represented, and Wp = 1: sample is proportional to total population.