code	label	ih1969	ih1970	ih1982	ih1997
rectype	DVINT	P	P	P	P
columns	Interval since last doctor visit	172	172	155	1461; 1713
norecode	Only selected years shown
<tt>	IHIS code	source code	source code	source code	source code
00	NIU				BB = NIU
10	Never	0=Never	0=Never	0=Never	5B = Never
10					B5 = Never
20	Less than 1 year			1=Less than 1 year
21	Visits in the past 2 weeks		1=Visit in the past 2 weeks
21		1=Visits in the past 2 weeks
21		2=Visit as inpatient in 2 weeks
22	2 weeks to less than 6 months	3=2 weeks to less than 6 months	3=2 weeks to less than 6 months
23	6 months or less				1B = 6 months or less
23					B1 = 6 months or less
23	6 months to less than 12 months	4=6 months to less than 12 months	4=6 months to less than 12 months
24	GT 6 month, not more than 1 year				2B = More than 6 months, but not more than 1 year ago
24					B2 = More than 6 months, but not more than 1 year
30	1 year plus
31	1 year to less than 2 years	5=1 year	5=1 year
31				2=1 to less than 2 years
32	2 years to less than 5 years	6=2 to 4 years	6=2 to 4 years
32				3=2 to less than 5 years
33	GT 1 year, not more than 3 years				3B = More than 1 year, but not more than 3 years ago
33					B3 = More than 1 year, but not more than 3 years ago
34	More than 3 years				4B = More than 3 years
34					B4 = More than 3 years
35	5+ years		7=5+ years	4=5 years or more
36	5 to 9 years	7=5 to 9 years
37	10+ years	8=10+ years
97	Unknown-refused				7B=Refused
97					B7=Refused
98	Unknown-not ascertained				8B=Not ascertained
98					B8=Not ascertained
99	Unknown-don't know (Pre1997: Unknown, all causes)	9=Unknown	9=Unknown	5=Unknown	9B=Don't know
99					B9=Don't know
</tt>