Table 1.

Baseline demographic characteristics of participants.

	Zagreb group			Essen group
	≤ 20	21–50	≥ 51	≤ 20	21–50	≥ 51	Total
N	1426	2474	1072	1600	2740	1247	10559
Age (years)
Mean ± SD	9.8 ± 5.7	35.7 ± 9.3	61.0 ± 8.1	8.6 ± 5.8	35.6 ± 9.4	60.9 ± 8.1	33.6 ± 20.1
Min;max	0∼20	21∼50	51∼90	0∼20	21∼50	51∼89	0∼90
Median	9.0	36.0	59.0	7.0	36.0	59.0	33.0
F	33.453	0.137	0.094				0.294
P value	0.000	0.711	0.759				0.587
Sex
Male n (%)	859 (60.2)	1236 (50.0)	513 (47.9)	958 (59.9)	1319 (48.1)	601 (48.2)	5486 (52.0)
Female n (%)	567 (39.8)	1238 (50.0)	559 (52.1)	642 (40.1)	1421 (51.9)	646 (51.8)	5073 (48.0)
Male/Female	1.51	1.00	0.92	1.49	0.93	0.93	1.08
F	0.042	1.725	0.027				0.934
P value	0.839	0.189	0.870				0.334