**Table 2:** Statistical significance of correlations: Kendall $\tau$ Analysis.
Quan. 1	Quan. 2	Sample	Size	$\tau$	$\sigma$
$N_{\rm C {\sc iv}}$	$(v_+-v_-)_{\rm C {\sc iv}}$	all	74	0.54	>6.0
		interv DLA^a	58	0.52	>6.0
		unsaturated^b	49	0.45	4.5
$\vert\bar{v}\vert _{\rm C {\sc iv}}$	$(v_+-v_-)_{\rm C {\sc iv}}$	all	74	0.34	4.3
		interv DLA	58	0.35	3.8
${\rm [Z/H]}$	$N_{\rm C {\sc iv}}$	all	74	0.45	>6.0
		interv DLA	58	0.46	5.1
		Zn II^d	37	0.40	3.5
		unsaturated	49	0.25	2.5
${\rm [Z/H]}$	$\Delta v_{\rm C {\sc iv}}$	all	74	0.28	3.4
		interv DLA	58	0.27	2.9
		Zn II	37	0.30	2.6
		unsaturated	49	0.14	1.4
${\rm [Z/H]}$	$(v_+-v_-)_{\rm C {\sc iv}}$	all	74	0.33	4.1
		interv DLA	58	0.30	3.3
		Zn II	37	0.29	2.5
		z<2.34	37	0.39	3.3
		z>2.34	37	0.34	2.9
${\rm [Z/H]}$	$v_{\rm max, C {\sc iv}}$	all	74	0.24	2.9
		interv DLA	58	0.24	2.6
		Zn II	37	0.22	1.9
$N_{\rm C {\sc iv}}$	$l_{\rm c}$	C II^* detected	21	0.30	1.9

^a In the intervening DLA sample, sub-DLAs and DLAs at <5000km s^-1 from the QSO were excluded. ^b In the unsaturated sample (considered for correlations involving $N_{\rm C {\sc iv}}$ or $\Delta v_{\rm C {\sc iv}}$ ), all saturated C IV lines were removed. ^c In the Zn II sample, cases where [Z/H] was derived from Si or S were excluded. This only applies to correlations involving [Z/H].

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