condition mean min max ZT0-3 14.1789925 14.011185000000001 14.3468 ZT4-7 6.01643 6.01643 6.01643 ZT8-11 2.6933949999999998 2.6933949999999998 2.6933949999999998 ZT12-15 0 0 0 ZT16-19 3.1288349999999996 3.1288349999999996 3.1288349999999996 ZT20-23 3.80044 3.80044 3.80044