Table 3.

Associated factors of coding by physicians

Coding	Coded* (n = 57,041)	Non-coded(n = 36,409)	Adjusted Odds Ratios** (95% C.I.)	p value
Patient
Age on appt. (no.%)
<50	6,414(11.2)	7,484(20.6)	1.000 (reference)
50–59	12,735(22.3)	9,704(26.7)	1.364(1.302, 1.429)	<0.001
60–69	13,566(23.8)	7,516(20.6)	1.774(1.692, 1.861)	<0.001
≥70	24,327(42.6)	11,705(32.1)	2.180(2.088, 2.277)	<0.001
Gender
Male	24,918(43.7)	15,412(42.3)	1.000 (reference)
Female	32,123(56.3)	20,997(57.7)	1.202(1.168,1.238)	<0.001
Payment status
Fee-waivers	15,475(27.1)	9,696(26.6)
Payers	41,566(72.9)	26,713(73.4)	Not significant
District of residence
Shatin	32,851(57.6)	12,120(33.3)	1.000 (reference)
Taipo	11,436(20.0)	11,156(30.6)	0.316(0.304, 0.327)	<0.001
North	9,995(17.5)	10,684(29.3)	0.330(0.318, 0.343)	<0.001
Others	2,759(4.8)	2,449(6.7)	0.405(0.381, 0.432)	<0.001
Service type
General	50,350(88.3)	34,524(94.8)	1.000 (reference)
FMSC	6,503(11.4)	1,673(4.6)	1.448(1.362, 1.539)	<0.001
Staff clinic	188(0.3)	212(0.6)	0.940(0.760, 1.162)	0.565
Appointment type (no./%)
New case	24,974(43.8)	23,831(65.5)	1.000 (reference)
Old case	32,067(56.2)	12,578(34.5)	2.394(2.324, 2.467)	<0.001

(FMSC: Family Medicine Specialist Clinic. *Coded group refers to patients having at least one code, either K86 or exclusion coding. **represent odds ratios after controlling for all the predictor variables)