Natural history of heartburn: A 10-year population-based study

Table 1 Transition among symptom subgroups between the initial and final surveys

FGID in 1996	Proportion of FGID in 2006 based on primary survey disorder (%)
	FD	IBS	Heartburn	Frequent abdominal pain	No symptoms
FD (n = 111)	52.31	21.63	14.43	1.83	9.94
IBS (n = 152)	25.02	30.31	19.73	4.63	20.44
Heartburn (n = 173)	12.12	12.12	39.31	4.63	31.84
Frequent abdominal pain (n = 39)	12.82	23.12	17.92	15.41	30.84
No symptoms (n = 324)	3.45	9.95	17.35	6.25	63.36

¹Stable;

²Increased symptoms;

³Decreased symptoms;

⁴Became asymptomatic;

⁵Developed symptoms;

⁶Remaining asymptomatic. FGID: Functional gastrointestinal disorder; FD: Functional dyspepsia; IBS: Irritable bowel syndrome.