Table 8:

Comparison with the results of other surveys for pulsating sdBs (upper part) and our own survey divided into subsamples (lower part).

Sample	Size	Pulsators		Fract.	Preselection
	#	S	C	%	on
South Africa	1200	13	7	1.7	No
Billeres	74	0	4	5.4	Yes
Dreizler	12	1	0	8	Yes
HS	80	9	0	10	Yes, -comp.
HE	23	0	0	0	Yes
SPY	27	3	0	11	Yes
SDSS	40	0	5	12.5	Yes
BG	11	1	0	9	Yes
Saffer	24	1	0	4	Yes
Maxted	24	0	0	0	Yes
colour	50	0	2	4	Poor

Notes. ``Size'' indicates the number of targets checked for variability in each sample. The number of pulsators discovered are separated into apparently single (S) and spectroscopic composites (C), but note that binaries with invisible (WD or dM) companions are included in the column for single pulsators. We also specify if the sample was preselected to contain only subdwarfs in the instability region or not. Note that a few of the pulsators are present in more than one sample, and that we keep the HS and HE stars observed only as part of the SPY survey apart from the HS and HE samples.