Table 3. Time delay from the first PHV to DHV.

Time interval (Days)	Overall	1997–2002	2003–2008	2009–2012	p*
First PHV to DHV	63(26–135)	91(58–161)	75(33–139)	39(15–104)	0.036
First PHV to first PUMCH visit	58(26–135)	88(58–158)	75(31–139)	34(12–101)	0.047
First PUMCH visit to DHV	0(0–4)	3(0–20)	0(0–4)	0(0–0)	0.084

PHV, previous health care visits; DHV, diagnostic health care visits, PUMCH, Peking Union Medical College Hospital.

*p values are for comparison among the three period groups.