Table 2.

Identification of under-served areas in terms of travel time

Type	Multilevel healthcare access zones
A	Effective service zone
B	Lack of Tier 1 healthcare facilities
C	Lack of Tier 2 healthcare facilities
D	Lack of Tier 3 healthcare facilities
E	Lack of Tier 2 and Tier 1 healthcare facilities
F	Lack of Tier 3 and Tier 1 healthcare facilities
G	Lack of Tier 3 and Tier 2 healthcare facilities
H	Lack of all tiers of healthcare facilities

Note: The Tier 1 healthcare institutions are clinics in urban areas and village clinics in rural areas. The Tier 2 healthcare institutions are CHCs in urban areas and THCs in rural areas. The Tier 3 healthcare institutions are hospitals. Based on the “one-hour circle to hospital care” and “30-min to primary care in rural areas and 15-min to primary care in urban areas” policy of Hainan Province, areas that do not meet the following requirements were identified as under-served:

Tier 3 healthcare institutions: travel time to hospital ≤60 min;

Tier 2 healthcare institutions: travel time to THCs ≤30 min or to CHCs ≤15 min;

Tier 1 healthcare institutions: travel time to village clinic ≤30 min or to urban clinic ≤15 min