On the surface, it does seem as if there is variability and perhaps a larger sample size or more items could lead to a significant finding (see limitations below), but at least for this study, the only significant finding was the difference between cardinal numbers and some.
1	On	on	ADP	IN	_	3	case	3:case	Discourse=adversative-concession:17->20:0
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	3:det	Entity=(26-abstract-new-cf8-2-sgl
3	surface	surface	NOUN	NN	Number=Sing	7	obl	7:obl:on	Entity=26)|SpaceAfter=No
4	,	,	PUNCT	,	_	3	punct	3:punct	_
5	it	it	PRON	PRP	Case=Acc|Gender=Neut|Number=Sing|Person=3|PronType=Prs	7	expl	7:expl	_
6	does	do	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	aux	7:aux	_
7	seem	seem	VERB	VB	Mood=Imp|Person=2|VerbForm=Fin	0	root	0:root	_
8	as	as	SCONJ	IN	_	11	mark	11:mark	_
9	if	if	ADP	IN	_	8	fixed	8:fixed	_
10	there	there	PRON	EX	PronType=Dem	11	expl	11:expl	_
11	is	be	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	7	advcl	7:advcl:as_if	_
12	variability	variability	NOUN	NN	Number=Sing	11	nsubj	11:nsubj	Entity=(27-abstract-new-cf5-1-sgl)
13	and	and	CCONJ	CC	_	23	cc	23:cc	Discourse=joint-list_m:18->17:0
14	perhaps	perhaps	ADV	RB	Degree=Pos	23	advmod	23:advmod	_
15	a	a	DET	DT	Definite=Ind|PronType=Art	18	det	18:det	Entity=(28-abstract-new-cf6-4-sgl
16	larger	large	ADJ	JJR	Degree=Cmp	18	amod	18:amod	_
17	sample	sample	NOUN	NN	Number=Sing	18	compound	18:compound	Entity=(29-abstract-new-cf11-1-sgl)
18	size	size	NOUN	NN	Number=Sing	23	nsubj	23:nsubj	Entity=28)
19	or	or	CCONJ	CC	_	21	cc	21:cc	_
20	more	more	ADJ	JJR	Degree=Cmp	21	amod	21:amod	Entity=(30-abstract-new-cf9-2-coref
21	items	item	NOUN	NNS	Number=Plur	18	conj	18:conj:or|23:nsubj	Entity=30)
22	could	could	AUX	MD	Number=Sing|Person=3|VerbForm=Fin	23	aux	23:aux	_
23	lead	lead	VERB	VB	VerbForm=Inf	11	conj	7:advcl:as_if|11:conj:and	_
24	to	to	ADP	IN	_	27	case	27:case	_
25	a	a	DET	DT	Definite=Ind|PronType=Art	27	det	27:det	Entity=(31-abstract-new-cf10-3-sgl
26	significant	significant	ADJ	JJ	Degree=Pos	27	amod	27:amod	_
27	finding	finding	NOUN	NN	Number=Sing	23	obl	23:obl:to	Entity=31)
28	(	(	PUNCT	-LRB-	_	29	punct	29:punct	Discourse=adversative-concession:19->18:0|SpaceAfter=No
29	see	see	VERB	VB	Mood=Imp|Person=2|VerbForm=Fin	23	parataxis	23:parataxis	_
30	limitations	limitation	NOUN	NNS	Number=Plur	29	obj	29:obj	Entity=(32-abstract-new-cf7-1-coref)
31	below	below	ADV	RB	Degree=Pos	29	advmod	29:advmod	SpaceAfter=No
32	)	)	PUNCT	-RRB-	_	29	punct	29:punct	SpaceAfter=No
33	,	,	PUNCT	,	_	34	punct	34:punct	_
34	but	but	CCONJ	CC	_	47	cc	47:cc	Discourse=ROOT:20:0
35	at	at	ADV	IN	_	39	advmod	39:advmod	_
36	least	least	ADJ	JJS	Degree=Sup	35	fixed	35:fixed	_
37	for	for	ADP	IN	_	39	case	39:case	_
38	this	this	DET	DT	Number=Sing|PronType=Dem	39	det	39:det	Entity=(33-abstract-acc:com-cf4-2-coref
39	study	study	NOUN	NN	Number=Sing	47	nmod	47:nmod:for	Entity=33)|SpaceAfter=No
40	,	,	PUNCT	,	_	39	punct	39:punct	_
41	the	the	DET	DT	Definite=Def|PronType=Art	44	det	44:det	Bridge=33<34|Entity=(34-abstract-acc:inf-cf1-4-coref
42	only	only	ADJ	JJ	Degree=Pos	44	amod	44:amod	_
43	significant	significant	ADJ	JJ	Degree=Pos	44	amod	44:amod	_
44	finding	finding	NOUN	NN	Number=Sing	47	nsubj	47:nsubj	Entity=34)
45	was	be	AUX	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	47	cop	47:cop	_
46	the	the	DET	DT	Definite=Def|PronType=Art	47	det	47:det	Entity=(34-abstract-giv:act-cf1-2-coref
47	difference	difference	NOUN	NN	Number=Sing	7	conj	7:conj:but	_
48	between	between	ADP	IN	_	50	case	50:case	_
49	cardinal	cardinal	ADJ	JJ	Degree=Pos	50	amod	50:amod	Entity=(22-abstract-giv:act-cf2*-2-coref
50	numbers	number	NOUN	NNS	Number=Plur	47	nmod	47:nmod:between	Entity=22)
51	and	and	CCONJ	CC	_	52	cc	52:cc	_
52	some	some	DET	DT	PronType=Ind	50	conj	47:nmod:between|50:conj:and	Entity=(24-abstract-giv:act-cf3-1-ana)34)|SpaceAfter=No
53	.	.	PUNCT	.	_	7	punct	7:punct	_
