Colchester United picked up three crucial points to leapfrog Town, while Rochdale cut the gap after a draw with Newport County.
Town are now five points above the drop zone and are given a 16 per cent chance of getting relegation according to the supercomputer.
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1. Leyton Orient - 93pts (+34)
Win the league: 61%
Promoted: 93% Photo: Pete Norton
2. Stevenage - 86pts (+25)
Play-off chances: 26%
Promotion chances: 73%
Win the league: 21% Photo: David Price
3. Northampton Town - 82pts (+25)
Play-off chances: 37%
Promotion chances: 60%
Win the league: 10% Photo: Pete Norton
4. Salford City - 75pts (+18)
Play-off chances: 44%
Promotion chances: 34% Photo: Charlotte Tattersall