condition mean min max ZT0-3 0.14241383333333332 0.0 0.4272415 ZT4-7 3.540375 3.540375 3.540375 ZT8-11 1.720655 1.720655 1.720655 ZT12-15 5.9808 5.582 6.3796 ZT16-19 3.6596 3.6596 3.6596 ZT20-23 1.139995 1.139995 1.139995