Table 2.

 Comparison of numbers (95% confidence intervals) of drug related suicides and undetermined deaths in England and Wales with non-fatal self poisoning in Oxford, 1997-9, for co-proxamol, paracetamol, and tricyclic antidepressants (used alone). Odds ratios shown with 95% confidence intervals

	Co-proxamol	Tricyclic antidepressants	Paracetamol
Deaths in England and Wales/year	255 (238 to 274)	309 (289 to 330)	123 (110 to 136)
Non-fatal self poisonings in Oxford/year	26 (21 to 33)	73 (64 to 83)	356 (335 to 378)
Odds ratio for relative lethality compared with paracetamol	28.1 (24.9 to 32.9)	12.3 (11.5 to 13.2)	1.0
Odds ratio for relative lethality compared with tricyclics	2.3 (2.1 to 2.5)	1.0	0.08 (0.08 to 0.09)