Drowning and submersion

< causes of Injury

Water-based activities such as swimming and bathing are usually safe, when risks are managed. However, environmental conditions or accidents can lead to submersion injuries or death by drowning. Some submersion injuries can have long-term effects, such as when the brain goes without oxygen for too long.

Drowning and submersion injuries caused:

This represents 0.1% of injury hospitalisations and 1.7% of injury deaths.

Both swimming pools and natural bodies of water were common locations of drowning and submersion accidents that led to hospitalisation, while natural bodies of water were the most common location for drowning deaths. Males were 3.3 times as likely to die from drowning as females. Children aged under 5 had the highest rate of hospitalisation.

This report summarises data on accidental drowning and submersion events only. Intentional events are included under Self-harm injuries and suicide. Falling overboard from a watercraft is included under Transport accidents.

Locations where drowning and submersions occur

Swimming pools are the most common location of drowning and submersion accidents that lead to hospital admission, closely followed by natural bodies of water (Table 1).

Notes

1. Rates are crude per 100,000 population.
2. Percentages may not total 100 due to rounding.
3. Codes in brackets refer to the ICD-10-AM (11th edition) external cause codes (ACCD 2019).

Source: AIHW National Hospital Morbidity Database

Natural bodies of water are the most common location of drowning and submersion accidents that led to death (Table 2).

Notes

1. Rates are crude per 100,000 population.
2. Percentages may not total 100 due to rounding.
3. Codes in brackets refer to the ICD-10 external cause codes (WHO 2011).

Source: AIHW National Mortality Database

For more detail, see Data tables B3–4 and E4–5.

Seasonal differences

Hospital admissions due to drowning and submersion show a strong seasonal pattern, and are highest in summer.

The interactive display shows other seasonal changes in injury hospitalisations.

Figure 1: Seasonal differences in drowning and submersion hospitalisations, 2018–19 to 2020–21

Notes
1. Admission counts have been standardised into two 15-day periods per month.
2. A scale-up factor has been applied to June admissions to account for cases not yet separated.

Source: AIHW National Hospital Morbidity Database.

Trends over time

The age-standardised rate of hospitalisations due to drowning and submersion in 2020–21 was 4.9% higher than the previous year.

Over the period from 2011–12 to 2016–17 there was an average annual increase of 4.2%.

There is a break in the time series for hospitalisations between 2016–17 and 2017–18 due to a change in data collection methods (see the technical notes for details).

For drowning deaths, the age-standardised rate for 2019–20 was 15% lower than a year earlier. The average annual decrease in rate between 2011–12 and 2019–20 was 5.0% (Figure 2).

Figure 2: Drowning and submersion hospitalisations and deaths, by sex and year

For more detail, see Data tables C1–3 and F1–4.

Age and sex differences

Rates of hospitalisation and death due to drowning and submersion differ by age group and sex (Figure 3).

For hospitalisations caused by drowning and submersion in 2020–21:

• 59% were for males
• children aged 0–4 had the highest rate
• the age-standardised rates were:
  • 2.8 cases per 100,000 males and
  • 1.9 cases per 100,000 females.

For drowning deaths in 2019–20:

• males aged 65 and over had the highest rates
• the age-standardised rates were:
  • 1.3 per 100,000 males and
  • 0.4 per 100,000 females.

Figure 3: Drowning and submersion hospitalisations and deaths, by age group and sex

For more detail, see Data tables A1–3 and D1–3.

Severity

There are many ways that the severity, or seriousness, of an injury can be assessed. Some of the ways to measure the severity of hospitalised injuries are:

• number of days in hospital
• time in an intensive care unit (ICU)
• time on a ventilator
• in-hospital deaths.

The percentage of cases that included time in the ICU, the percentage that involved continuous ventilatory support, and the rate of in-hospital deaths were among the highest of all injury causes (Table 3).

Note: Average number of days in hospital (length of stay) includes hospitalisations that are transfers from 1 hospital to another or transfers from 1 admitted care type to another within the same hospital, except where care involves rehabilitation procedures.

Source: AIHW National Hospital Morbidity Database.

For more detail, see Data tables A13–15.

Aboriginal and Torres Strait Islander people

Among Aboriginal and Torres Strait Islander people, drowning and submersion injuries led to:

• 45 hospitalisations in 2020–21(Table 4) and
• 4 deaths in 2019–20.

Source: AIHW National Hospital Mortality Database.

Indigenous and non-Indigenous Australians

In 2020–21, Indigenous Australians, compared with other Australians, after adjusting for differences in population age structure, were 1.7 times as likely to be hospitalised due to a drowning and submersion injury. Readers are advised to use these data with caution due to small numbers.

Deaths data are not compared here because of the small numbers.

For more detail, see Data tables A4–A6 and D4–D8.

Remoteness

In 2020–21, people living in Inner regional areas had higher age-standardised rates of hospitalisation due to drowning and submersion than people living in Major cities (Figure 5) (Data table A9). Rates of death are not compared here due to small numbers.

Figure 4: Drowning and submersion injury hospitalisations by remoteness and sex, 2020–21

For more detail, see Data tables A7–9 and D9–10.

For information on how the statistics were calculated by remoteness, see the technical notes.

Data details

Technical notes: how the data were calculated

Data tables: download full data tables

Glossary
 

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