condition mean min max ZT0-3 0.3488903333333333 0.2647675 0.4269765 ZT4-7 0.0963435 0.0963435 0.0963435 ZT8-11 0.3259155 0.3259155 0.3259155 ZT12-15 0.5878315 0.5021665 0.6734964999999999 ZT16-19 0.650575 0.650575 0.650575 ZT20-23 0.592946 0.592946 0.592946