Intelligibility in Context Scale: validity of the Brazilian-Portuguese version

Alpes, Matheus Francoy; Cipolato, Julia; Valente, Ana Rita; Nascimento, Jacqueline Aquino do; Mandrá, Patrícia Pupin; Lousada, Marisa

doi:10.1590/2317-1782/e20240138en

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Original Article • CoDAS 37 (3) • 2025 • https://doi.org/10.1590/2317-1782/e20240138en linkcopy

Intelligibility in Context Scale: validity of the Brazilian-Portuguese version

Authorship SCIMAGO INSTITUTIONS RANKINGS

Purpose The aim of the study was to validate the Brazilian-Portuguese version of the Intelligibility in Context Scale (ICS-BP).

Methods Sixty children (mean age in months = 55.05, SD = 4.2), 15 with parental or teacher concerns regarding their speech and 45 without concerns, underwent assessment using the phonology subtest of ABFW – Child Language Test. The percentage of consonants correct (PCC) was calculated and parents completed the ICS to evaluate their children's intelligibility with various communication partners. Descriptive statistics were obtained. Kruskal-Wallis and Spearman’ tests were used for independent group comparisons and correlation calculations, respectively. Linear regression models were established to predict PCC. Internal consistency was calculated using Cronbach's alpha. A Receiver Operating Characteristic (ROC) was used to analyse sensitivity and specificity. Significance was considered for p-values under 0.05.

Results The majority of parents reported a mean score of 4.6 in a total of 5 (SD .10) at the ICS responses with different listeners, with better performance with other acquaintances and members of the family. The ICS demonstrated excellent internal consistency (α = 0.95). Positive correlations were found between ICS scores and PCC (r = .790) and a simple linear model was established between the ICS mean score and PCC. Sensitivity (0.98) and specificity (0.87) were considered high.

Conclusion The ICS-BP indicated high psychometric values, suggesting that this instrument can be used to measure the intelligibility of Brazilian children.

Keywords:
Speech Intelligibility; Validation Study; Child Language; Speech, Language and Hearing Sciences

Variables	N (%)		N (%)
Gender	46 (76.7)	Socio-economic status	10 (16.7)
Male	14 (23.3)	High	48 (80)
Female		Medium	2 (3.3)
		Low	2 (3.3)
Age (months)	20 (33.3)	Ear infection history	4 (6.7)
49-53	25 (41.7)	Yes	56 (93.3)
54-59	15 (25)	No
>60

	ICS	PCC
	M±SD P25;Med;P75	M±SD P25;Med;P75
Gender
Male (N = 46)	4.58±0.59 4.39;4.86;5.00	92.93±7.75 89.75;92.00;100.0
Female (N = 14)	4.71±0.63 4.71;4.93;5.00	95.79±8.62 93.50;100.0;100.0
Statistical result	X²(1)=0.555; p=0.456	X²(1)=2.238; p=0.135
Effect size	0.01	0.04
Age
<53 (N = 20)	4.67±0.66 4.71;4.93;5.00	94.25±9.22 89.25;100.0;100.0
54-59 (N = 25)	5.00±0.46 4.57;5.00;5.00	93.80±6.72 90.0;92.00;100.0
>60 (N = 15)	4.39±0.68 4.00;4.71;5.00	95.00±8.57 89.0;95.0;100.0
Statistical result	X²(1)=3.908; p=0.142	X²(1)=1.087; p=0.581
Effect size	0.07	0.02
Socioeconomic status
High (N = 10)	4.48±0.77 4.00;4.78;5.00	93.00±9.56 89.25;96,00;100.0
Medium (N = 48)	4.67±0.52 4.60;4.86;5.00	93.92±7.50 90.0;98.0;100.0
Low (N = 2)	4.00±1.41 3.00;4.00	89.00±15.55 78.00;89.00
Statistical result	X²(1)=0.594; p=0.743	X²(1)=0.594; p=0.743
Effect size	0.01	0
Parents evaluation
With identified concern (N = 15)	3.80±0.71 3.14;4.00;4.29	85.73±9.30 78.0;90,0;92.0
No identified concern (N = 45)	4.88±0.15 4.71;5.00;5.00	96.22±5.46 91.00;100.0;100.0
Statistical result	X²(1)=28.577; p<.001	X²(1)=14.224; p<.001
Effect size	0.48	0.24

Item	Mean ± SD		Always (5)		Usually (4)		Sometimes (3)		Rarely (2)		Never (1)
Item	With identified concern	No concern	With identified concern	No concern	With identified concern	No concern	With identified concern	No concern	With identified concern	No concern	With identified concern	No concern
Do you understand your child?	4.07 ± (0.70)	4.71 ± (0.46)	4 (26.7%)	32 (71.1%)	8 (53.3%)	13 (28.9%)	3 (20%)	0	0	0	0	0
Do immediate members of your family understand your child?	4.07 ± (1.03)	4.89 ± (0.32)	7 (46.7%)	40 (88.9)	3 (20%)	5 (11.1%)	4 (26.7%)	0	1 (6.7%)	0	0	0
Do extended members of your family understand your child?	3.67 ± (0.90)	5 ± (0)	2 (13.3%)	45 (100%)	8 (53.3%)	0	3 (20%)	0	2 (13.3%)	0	0	0
Do your child’s friends understand your child?	3.73 ± (0.70)	4.96 ± (0.21)	2 (13.3%)	43 (95.6%)	7 (46.7%)	2 (4.4%)	6 (40.0%)	0	0	0	0	0
Do other acquaintances understand your child?	3.93 ± (0.80)	4.96 ± (0.21)	4 (26.7%)	43 (95.6%)	6 (40.0%)	2 (4.4%)	5 (33.3%)	0	0	0	0	0
Do your child’s teachers understand your child?	3.73 ± (0.70)	4.98 ± (0.15)	2 (13.3%)	44 (97.8%)	7 (46.7%)	1 (2.2%)	6 (40.0%)	0	0	0	0	0
Do strangers understand your child?	3.47 ± (0.74)	4.73 ± (0.45)	1 (6.7%)	33 (73.3%)	6 (40.0%)	12 (26.7%)	7 (46.7%)	0	1 (6.7%)	0	0	0

Item	1. Parent	2. Immediate family	3. Extended family	4. Child’s friends	5. Acquaintances	6. Teachers	7. Strangers
1. Parent	1	0.65	0.62	0.62	0.54	0.60	0.68
2. Immediate family		1	0.81	0.73	0.78	0.75	0.58
3. Extended family			1	0.91	0.90	0.93	0.80
4. Child’s friends				1	0.86	0.98	0.79
5. Acquaintances					1	0.87	0.76
6. Teachers						1	0.78
7. Strangers							1

		PCC	ICS
Spearman	PCC	1.000	.793
Correlation	ICS	.793	1.000
Sig.			<001

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[1] Descriptive statistics were presented in terms of counts and percentages