Table 3.

Chronic diseases and the number of hospital visits in the past year among Shidu parents with or without PGD.

	PGD-positive group		PGD-negative group
	n = 33		n = 116
	n	﹪	n	﹪	χ2	p-value
Chronic diseases
Hypertension	12	36.4	42	36.2	0.00	0.987
Coronary heart disease	11	33.3	27	23.3	1.37	0.242
Diabetes mellitus	4	12.1	16	13.8	0.06	0.804
Cerebrovascular diseases	0	0.0	6	5.2	0.69	0.406
Respiratory diseases	2	6.1	7	6.0	0.00	0.996
Digestive diseases	3	9.1	5	4.3	0.41	0.524
Rheumatosis	3	9.1	5	4.3	0.41	0.524
Osteoarthrosis	10	30.3	13	11.2	7.18	0.007**
Tumour	2	6.1	9	7.8	0.00	1.000
Mental diseases	3	9.1	6	5.2	0.18	0.675
Other	2	6.1	13	11.2	0.29	0.590
Number of hospital visits
0–2	4	12.1	34	29.3	6.59	0.086
3–5	7	21.2	16	13.8
6–9	2	6.1	14	12.1
≥10	20	60.6	52	44.8
Total	33	100.0	116	100.0

**p-value < 0.01.