condition mean min max ZT0-3 342.074201 342.074201 342.074201 ZT4-7 218.842299 218.842299 218.842299 ZT8-11 152.68444499999998 152.68444499999998 152.68444499999998 ZT12-15 198.56395700000002 198.56395700000002 198.56395700000002 ZT16-19 272.30969 272.30969 272.30969 ZT20-23 331.43042049999997 331.43042049999997 331.43042049999997