Table 1 Descriptive characteristics at baseline and 2 years later of study population according to dipper/non-dipper status

From: Autonomic nervous system activity is independently associated with the risk of shift in the non-dipper blood pressure pattern

	D1/D2 (n=335)		D1/ND2 (n=119)		ND1/D2 (n=71)		ND1/ND2 (n=75)		(Fisher's test)	Total (n=600)
	Mean	s.d.	Mean	s.d.	Mean	s.d.	Mean	s.d.	P	Mean	s.d.
Age (years)	65.63	0.74	65.70	0.91	65.74	0.93	65.70	0.82	0.64	65.69	0.81
BMI (kg m^–2)	24.90	3.24	24.90	3.52	24.68	3.27	24.62	3.60	0.89	24.78	3.34
Total cholesterol (mmol l^–1)	6.15	0.99	6.02	0.99	6.04	0.83	6.18	1.04	0.53	6.10	0.98
Fasting glycemia (mmol l^–1)	5.56	0.87	5.62	1.03	5.41	1.47	5.34	1.13	0.19	5.48	1.02
24-h systolic ambulatory BP at baseline	117.56	13.14	117.98	13.00	116.87	13.90	115.39	14.20	0.57	117.29	13.33
24-h diastolic ambulatory BP at baseline	75.57	7.49	75.72	7.74	75.33	7.21	75.07	8.28	0.94	75.51	7.60
Day systolic ambulatory BP at baseline	123.44	13.66	123.20	13.58	119.14	14.12	117.24	14.26	0.001	122.12	13.93
Day diastolic ambulatory BP at baseline	79.08	7.71	78.81	8.19	76.99	7.67	76.73	8.42	0.042	78.49	7.93
Night systolic ambulatory BP at baseline	100.37	12.27	102.63	12.72	110.94	13.63	110.00	14.11	<0.001	103.26	13.39
Night diastolic ambulatory BP at baseline	65.51	7.82	66.72	8.14	70.89	7.33	70.47	8.72	<0.001	67.00	8.21
24-h systolic ambulatory BP 2 years later	117.79	13.33	117.73	13.22	117.29	12.82	116.08	14.20	0.79	117.50	13.34
24-h diastolic ambulatory BP 2 years later	74.31	6.97	72.81	6.70	74.66	8.22	73.46	7.86	0.19	73.95	7.20
Day systolic ambulatory BP 2 years later	123.49	14.08	119.23	13.60	122.17	14.03	117.38	14.33	0.001	121.73	14.17
Day diastolic ambulatory BP 2 years later	77.79	7.39	74.59	7.01	77.39	8.52	74.81	7.64	<0.001	76.74	7.61
Night systolic ambulatory BP 2 years later	101.59	12.61	113.70	13.41	102.96	12.03	112.70	15.55	<0.001	105.53	14.14
Night diastolic ambulatory BP 2 years later	64.32	7.16	68.28	7.40	66.51	8.28	69.65	9.95	<0.001	66.02	8.00
	Percentage	n	Percentage	n	Percentage	n	Percentage	n	(Pearson's χ²)	Percentage	n
Men	43.28	145	36.97	44	50.70	36	32.00	24	0.08	41.50	249
Smoker	5.37	18	5.04	6	15.49	11	6.67	5	0.02	6.67	40
ASF index	37.01	124	35.29	42	38.03	27	40.00	30	0.93	37.17	223
Hypertensives at baseline	23.88	80	17.65	21	16.90	12	22.67	17	0.38	21.67	130
Hypertensives 2 years later	19.10	64	21.85	26	23.94	17	17.33	13	0.69	20.00	120
Hypertensive treatment 2 years later	27.16	91	29.41	35	23.94	17	30.67	23	0.79	27.67	166

Abbreviations: ASF, autonomic sleep fragmentation; BMI, body mass index; BP, blood pressure; D1, ND1, dipper, non-dipper at baseline; D2, ND2, dipper, non-dipper after 2 years.

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Table 1 Descriptive characteristics at baseline and 2 years later of study population according to dipper/non-dipper status

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