Most studies on the frequency of autism have had methodological problems. Most notable of these have been differences in diagnostic criteria between studies, degree of cases overlooked by the initial screening, and type of measurement. This study aimed to replicate the first report on childhood autism to address cumulative incidence as well as prevalence, as defined in the International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10) Diagnostic Criteria for Research. Here, the same methodological accuracy (exactness of a measurement to the true value) as the first study was used, but population size was four times larger to achieve greater precision (reduction of random error). A community-oriented system of early detection and early intervention for developmental disorders was established in the northern part of Yokohama, Japan. The city's routine health checkup for 18-month-old children served as the initial mass screening, and all facilities that provided child care services aimed to detect all cases of childhood autism and refer them to the Yokohama Rehabilitation Center. Cumulative incidence up to age 5 years was calculated for childhood autism among a birth cohort from four successive years (1988 to 1991). Cumulative incidence of childhood autism was 27.2 per 10000. Cumulative incidences by sex were 38.4 per 10000 in males, and 15.5 per 10000 in females. The male:female ratio was 2.5:1. The proportions of children with high-functioning autism who had Binet IQs of 70 and over and those with Binet IQs of 85 and over were 25.3% and 13.7% respectively. Data on cumulative incidence of childhood autism derived from this study are the first to be drawn from an accurate, as well as precise, screening methodology.

Most studies on the frequency of autism have had methodological problems. Most notable of these have been differences in diagnostic criteria between studies, degree of cases overlooked by the initial screening, and type of measurement. This study aimed to replicate the first report on childhood autism to address cumulative incidence as well as prevalence, as defined in the International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD‐10) Diagnostic Criteria for Research. Here, the same methodological accuracy (exactness of a measurement to the true value) as the first study was used, but population size was four times larger to achieve greater precision (reduction of random error). A community‐oriented system of early detection and early intervention for developmental disorders was established in the northern part of Yokohama, Japan. The city's routine health checkup for 18‐month‐old children served as the initial mass screening, and all facilities that provided child care services aimed to detect all cases of childhood autism and refer them to the Yokohama Rehabilitation Center. Cumulative incidence up to age 5 years was calculated for childhood autism among a birth cohort from four successive years (1988 to 1991). Cumulative incidence of childhood autism was 27.2 per 10 000. Cumulative incidences by sex were 38.4 per 10 000 in males, and 15.5 per 10 000 in females. The male: female ratio was 2.5:1. The proportions of children with high‐functioning autism who had Binet IQs of 70 and over and those with Binet IQs of 85 and over were 25.3% and 13.7% respectively. Data on cumulative incidence of childhood autism derived from this study are the first to be drawn from an accurate, as well as precise, screening methodology.

An extraction and refinement methodology utilizing child health surveillance programs achieve high efficacy for early detection of autism.

ObjectivesThis study examined the effectiveness of a newly developed work–family life support program on the work–family interface and mental health indicators among Japanese dual‐earner couples with a preschool child(/ren) using a randomized controlled trial with a waitlist.MethodsParticipants who met the inclusion criteria were randomly allocated to the intervention or the control groups (n = 79 and n = 85, respectively). The program comprised two 3‐h sessions with a 1‐month interval between them and provided comprehensive skills by including self‐management, couple management, and parenting management components. The program sessions were conducted on weekends in a community center room with 3–10 participants. Outcomes were assessed at baseline, 1‐month, and 3‐month follow‐ups. Primary outcomes were work–family balance self‐efficacy (WFBSE), four types of work–family spillovers (i.e., work‐to‐family conflict, family‐to‐work conflict, work‐to‐family facilitation, and family‐to‐work facilitation), psychological distress, and work engagement reported by the participants.ResultsThe program had significantly pooled intervention effects on WFBSE (P = .031) and psychological distress (P = .014). The effect sizes (Cohen's d) were small, with values of 0.22 at the 1‐month follow‐up and 0.24 at the 3‐month follow‐up for WFBSE, and −0.36 at the 3‐month follow‐up for psychological distress. However, the program had nonsignificant pooled effects on four types of work–family spillovers and work engagement.ConclusionsThe program effectively increased WFBSE and decreased psychological distress among Japanese dual‐earner couples with a preschool child(/ren).