Association of the incidence of atopic dermatitis until 3 years old with birth month and with sunshine duration and humidity in the first 6 months of life: Japan Environment and Children's Study.

ABSTRACT:

Objective

To compare the incidence of atopic dermatitis in children aged from 6 months to 3 years across birth seasons and climate conditions.

Design

Cohort study.

Setting

Fifteen regional centres across Japan.

Participants

A total of 100 304 children born from 2011 to 2014.

Exposure

Birth month, and mean sunshine duration (short/long) and humidity (high/low) in the first 6 months of life.

Primary outcome measure

Incidence of atopic dermatitis.

Results

The highest incidence of atopic dermatitis was in children born in the months of October to December. The lowest incidence of atopic dermatitis was in the months of April to June and in periods with a long duration of sunshine and high humidity. Low humidity was significantly associated with

SUBMITTER: Yokomichi H 

PROVIDER: S-EPMC8258573 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature