**Table 3:** Upper lifetime limits $T_{\rm {max}}$ at different significance levels for 1612 MHz OH masers, based on observations of the Arecibo sample. Q_n^m is the probability for finding at least m extinguished masers among n stars reobserved after $\Delta t$ years.
n	m	$\Delta t$	$T_{\rm {max}}$	Q_n^m	Comments
		[yr]	[yr]	[%]
112	4	12	2410	0.2	3 $\sigma$	Arecibo
112	4	12	1005	4.6	2 $\sigma$	sample
112	4	12	476	31.2	1 $\sigma$

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