condition mean min max ZT0-3 0.6827373333333334 0.245757 1.05384 ZT4-7 0.3262946 0.3262946 0.3262946 ZT8-11 1.7433420000000002 1.7433420000000002 1.7433420000000002 ZT12-15 5.0063675 4.776145 5.23659 ZT16-19 4.043985 4.043985 4.043985 ZT20-23 1.966545 1.966545 1.966545