Table 6. Maximal exercise capacity by parental characteristics (univariate analysis).

		Wmax (Watt)
	N	Mean	SD	P
Parental education				<0.001
Post-graduate	2,838	316	48
Post-secondary ≥3 years	41,479	316	48
Post-secondary <3 years	36,947	314	49
Upper secondary 3 years	31,989	307	49
Upper secondary ≤2 years	59,986	302	50
Primary/secondary 9–10 years	24,511	298	50
Primary/secondary <9 years	12,247	292	52
Unspecified	8,823	298	51
Socio Economic Index (SIE)				<0.001
Self-employed professionals	10,111	315	49
Professionals/higher non-manual employees	35,948	315	48
Entrepreneurs	16,871	304	50
Intermediate non-manual employees	52,830	312	49
Assistant non-manual employees, lower level	6,438	301	49
Assistant non-manual employees, higher level	19,788	307	50
Skilled employees in goods production	27,978	300	51
Skilled employees in service production	7,675	303	49
Unskilled employees in goods production	12,032	295	51
Unskilled employees in service production	15,020	296	50
Farmers	4,155	300	50
Non-classified employees	5,638	304	49
Non-active gainfully employed	2,865	289	51
Missing data	1,471	299	47
Parental income				<0.001
High	96,400	313	49
Medium	104,237	302	50
Low	10,959	296	50
	7,224	298	51