India was short of more than half a million police officers on January 1, 2015, the last date for which nationwide is are available, the Lok Sabha, Parliament’s lower house, was told on Tuesday. But our analysis of global police staffing patterns and murder rates in six countries suggests that more police do not necessarily mean less crime.

Sources: Lok Sabha, unstarred question no 1506, July 26, 2016; South Asia Terrorism Portal; World Bank, International Homicides; Police Reform in Mexico, Daniel M Sabet, Stanford University Press; Interpol. Note: This is an indicative chart. Police-population ratios and homicide rates are not always for the same years. We have used homicide rates as a means of comparison between countries because the definition of crime varies globally and comparable data are not readily available.

Longer hours

Where the police-population ratios clearly do matter is in the hours that police work in India. Up to 90% of Indian police officers currently work for more than eight hours a day, according to this 2014 report from the Bureau of Police Research and Development. The report said 68% of police report that they work 11 hours a day, and 28% report 14-hour work days. Nearly half report that they are called to duty between eight and 10 times a month during offs.

There were 17.2 million police officers across 36 states and union territories, when there should have been 22.6 million, according to the Ministry of Home Affairs. There should be an officer for every 547 Indians, according to a government-mandated ratio – called “sanctioned strength” in official jargon – but the number is one for every 720.

This is among the lowest police-population ratios in the world. In the US, there is an officer for 436 people, in Spain, there is one for 198, and in South Africa, one for 347.

In a ranking of 50 countries, India was the second from the bottom, better only than Uganda, according to this 2010 report from the United Nations Office on Drugs and Crime. That year, there was a police officer for every 775 Indians, so the figure presented to the Lok Sabha shows an improvement.

There should be an officer for every 454 people, according to UN standards quoted in the South Asian Terrorism Portal. Using those standards, Bihar needs more than three times as many police officers. Even by Indian standards, the state needs 2.7 times more police officers.

Crime rate

While it appears logical that a favorable police-population ratio is correlated with a lower crime rate globally, research on their relationship is inconclusive, even contradictory, according to this 2010 American study. Our analysis of police-population ratios and homicide rates appears to agree.

In India, insurgencies and other extreme examples of lawlessness in some states push up crime rates, despite seemingly adequate police staffing. For instance, in Chhattisgarh – wracked by a Maoist insurgency –has a police officer for 574 people, not far from the Indian standard.

This article first appeared on IndiaSpend , a data-driven and public-interest journalism non-profit.