Table 1.

Demographic data and results of screening procedures for the 24 subjects who completed the study.^*

				Maximum tolerated dose (mg day−1)
Subject	Age (years)	Gender	FEV1 (% predicted)	Diltiazem	Nifedipine
01	26	M	47	360	160
03	23	F	100	360	80
04	21	F	96	360	40
05	24	F	89	360	120
06	20	F	84	360	80
07	38	M	52	240	80
08	24	F	60	360	80
09	25	M	68	360	80
10	23	M	75	480	120
11	23	M	71	360	80
12	22	M	47	480	80
13	19	F	94	480	120
14	32	M	60	360	80
15	35	M	98	480	120
16	24	M	78	480	120
17	20	F	60	480	120
18	22	F	66	480	40
20	26	M	71	240	40
21	18	M	63	360	80
23	22	F	91	360	40
24	24	M	82	360	40
25	23	M	91	480	80
27	24	F	68	360	160
30	24	F	100	360	40
Mean	24	13M/11F	75	390	87
s.e. mean	1		3	15	7

^*Three of the subjects were excluded from final data analysis because of packaging errors in the blinded treatments.