Para table tennis

• Class 1:
  No sitting balance with severe reduction of function in the playing arm.
• Class 2:
  No sitting balance with reduction of function in the playing arm.
• Class 3:
  No sitting balance, although the upper part of the trunk may show activity.
  Normal arms, although some slight motor losses can be found in the playing hand without significant effect on table tennis skills.
  The non-playing arm keeps the trunk in position.
• Class 4:
  Existing sitting balance although not optimal because of non-existing anchorage (stabilisation) of the pelvis.
• Class 5:
  Normal function of trunk muscles.

Four-time Olympian Natalia Partyka participates in Class 10 events at the para table tennis tournaments.

• Class 6:
  Severe impairments of legs and arms.
• Class 7:
  Very severe impairments of legs (poor static and dynamic balance), or
  severe to moderate impairments of playing arm, or
  combination of arms and legs impairments less severe than in class 6.
• Class 8:
  Moderate impairments of the legs, or
  moderate impairments of playing arm (considering that elbow and shoulder control is very important), or
  moderate cerebral palsy, hemiplegia or diplegia with good playing arm.
• Class 9:
  Mild impairments of the leg(s), or
  mild impairments of playing arm, or
  severe impairments of non-playing arm, or
  mild cerebral palsy with hemiparesis or monoplegia.
• Class 10:
  Very mild impairments in legs, or
  very mild impairment of playing arm, or
  severe to moderate impairment of non-playing arm, or
  moderate impairment of the trunk.
• Class 11:
  For players with an intellectual disability.

If the receiver is in wheelchair, the service shall be a let under the following circumstances:[4]

1. After touching the receiver's court, the ball returns in the direction of the net.
2. The ball comes to rest on the receiver's court.
3. In singles, the ball leaves the receiver's court after touching it by either of its sidelines.

If the receiver strikes the ball before it crosses a sideline or takes a second bounce on his or her side of the playing surface, the service is considered good and no let is called.[5]

When two players who are in wheelchairs are a pair playing doubles, the server shall first make a service, the receiver shall then make a return but thereafter either player of the disabled pair may make returns.[6] However, no part of a player's wheelchair shall protrude beyond the imaginary extension of the center line of the table. If it does, the umpire shall award the point to the opposing pair.

If both players or pairs are in a wheelchair, the player or the pair score a point if:[7]

1. the opponent does not maintain a minimum contact with the seat or cushion(s), with the back of the thigh, when the ball is struck.
2. the opponent touches the table with either hand before striking the ball.
3. the opponent's footrest or foot touches the floor during play.

Wheelchairs must have at least two large wheels and one small wheel.[5] If the wheels on the player's wheelchair become dislodged and the wheelchair has no more than two wheels, then the rally must be stopped immediately and a point awarded to their opponent.

The height of one or maximum two cushions is limited to 15 cm in playing conditions with no other addition to the wheelchair. In team and class events, no part of the body above the knees may be attached to the chair as this could improve balance.