Table 2.

Experimental computing time (seconds) for identification of total drug exposure (multiplication)

Lambda (security measure in bits)	Multiplication depth	Time to encrypt all data for one patient	Time to multiply weight and dose data for all months	Time to add total exposure for one patient	Time to decrypt summary data for one patient	Total computation time for one patient	Estimated total time for 5000 patients
128	8	13.3	14.7	2.6	0.2	30.8	42 h
256	8	13.3	14.9	2.6	0.2	31.0	43 h
256	16	56.8	42.4	5.3	0.8	105.3	146 h

^aThe final decryption times of the results occur only once at the end of each analysis. All times in seconds unless otherwise specified