Title: “Quantità e variabilità nell’input adulto: uno studio longitudinale italiano con un gruppo di bambini preverbali”
Description: dataset of an oral presentation
Theme: examining the relationship between quality, quantity, variability in the linguistic input and infant’s language development. 
Modification date: May 2024

Variables' meanings:
 
ID = child's code	
AGE T1	= age at T1
T2_age = age at T2	
t3_age	= age at T3
T1_expressive_PVB = number of produced words at T1 (MBCDI)	
T1_receprive_PVB = number of comprehended words at T1 (MBCDI)	
T1_gestures_PVB	= number of gestures at T1 (MBCDI)
T2_expressive_PVB = number of produced words at T2 (MBCDI)		
T2_PVB_GROUP = group 1 (expressive vocabulary = 0); group 2 (expressive vocabulary = or > 1)
T2_receprive_PVB = number of comprehended words at T2 (MBCDI)		
T2_gestures_PVB	 = number of produced words at T2 (MBCDI)		
T3_expressive_PVB = number of produced words at T3 (MBCDI)		
T3_receprive_PVB = number of comprehended words at T3 (MBCDI)		
t4_pvb_prod = number of produced words at T4 (MBCDI)
T1_AWC/MIN_NO SIL = Adult word counts/minute (silence is not considered) at T1
T1_CTC/MIN_NO SIL = Conversational turns count/minute (silence is not considered) at T1
T1_CVC/MIN_NO SIL = child vocalizations count/minute (silence is not considered) at T1	
T1_TARGCHILD NEAR_CHN = target child's vocalizations clearly produced at T1
T1_CHN_Vegetative sounds = vegetative sounds produced by the target child at T1
T1_CHN_Voc = vocalizations produced by the target child at T1
T1_CHN_Cry = cry produced by the target child at T1
T1_MALE NEAR_MAN = production coming from a male voice close to the child at T1	
T1_MALE FAR_MAF = production coming from a male voice far from the child at T1
T1_FEMALE NEAR_FAN = production coming from a female voice close to the child at T1	
T1_FEMALE FAR_FAF = production coming from a female voice far from the child at T1
T1_%meaningful = % of meaningful speech at T1
T1_%not_mea = % of not-meaningful speech at T1
T1_%silence = % of silence at T1	
T1_%over = % of overlap speech at T1	
t2_Vegetative sounds_NEAR = vegetative sounds produced by the target child at T2	
t2_Voc_NEAR = vocalizations produced by the target child at T2 
t2_Cry_NEAR = cry produced by the target child at T2
T2_AWC/MIN_NO SIL = Adult word counts/minute (silence is not considered) at T2
T2_CTC/MIN_NO SIL =  Conversational turns count/minute (silence is not considered) at T2
T2_CVC/MIN_NO SIL = child vocalizations count/minute (silence is not considered) at T2	
T2_%meaningful = % of meaningful speech at T2	
T2_%not_mea = % of not-meaningful speech at T2
T2_%silence = % of overlap speech at T2
T1_social occasions nr_ diary = number of social occasions (at T1)
T1_nr of interacting adults_diary = number of adults interaction with the target child (T1)	
CATEG_NR ADULTS	delta PVB =  1 means 2-3 speakers; 2 means 4-5 speakers; 3 means > 6 speakers
t1_awc_raw = raw number of adult words counts at T1
t2_awc_raw = raw number of adult words counts at T2	
t1_ctc_raw = raw number of conversational turns count at T1	
t2_ctc_raw = raw number of conversational turns count at T2	
t1_cvc_raw = raw number of child vocalization counts at T1	
t2_cvc_raw = raw number of child vocalization counts at T2