Characteristic		n	%
Sex	Female	203	70
Sex	Male	87	30
Age	17 - 20	167	57.6
	21 -24	100	34.5
	25andmore	23	7.9
Place of birth	In the state of San Luis Potosí	262	90.3
Place of birth	In another location	28	9.7
Residence	In the state capital	276	95.2
Residence	In another location	14	4.8
Heredofamilial factors	Parents with chronic degenerative disease	254	87.6
Heredofamilial factors	Without factors	36	12.4