[Test method for pre-speech language: II. Outline of test result].
UNLABELLED: The tests as reported in the previous paper were conducted on 281 healthy babies. The test included 47 items. An accomplished item was accorded one point, and the total points were counted. RESULTS: descriptive statistics: i) Table 4 shows the proportion of right answers of each item by age (day). The day when the item was accomplished was definite and showed the properties of development. ii) Fig. 1 and table 1 showed the relationship between the total points and the age (day). The total points increased linearly with age (day). Discussion of test properties: i) Reliability: special attention was devoted to maintain consistent conditions on item formation to increase reliability. Consequently, the confidence coefficient was 0.989 in all cases. ii) VALIDITY: predictive validity was tested. The changes in language ability were investigated in 90 cases for observation over the passage of time (including cases other than those for standardization). The cases were divided into three groups by age (0-200, 201-400, 401-day) (Table 7). For an estimated value, the PPV was 0.60-0.67 and the NPV was 0.94-1.00 (Table 8). The NPV was higher than the PPV. iii) Test construction and figure of test construction: it was found that the test construction was composed of five factors and had stages of development as follows. (1) Initial call, communication (2) Positive appeal to the surrounding (3) Stage just before speech (4) Initial language acquirement and differentiation of language function (5) Speech-increasing stage The items included in each factor (each stage) are shown in the Fig. 1. profile in the previous paper.(ABSTRACT TRUNCATED AT 250 WORDS)