condition mean min max ZT0-3 73.960483 73.960483 73.960483 ZT4-7 23.486967 23.486967 23.486967 ZT8-11 20.048678000000002 20.048678000000002 20.048678000000002 ZT12-15 28.900523999999997 28.900523999999997 28.900523999999997 ZT16-19 17.2831925 17.2831925 17.2831925 ZT20-23 18.3040545 18.3040545 18.3040545