condition mean min max ZT0-3 0.44588615 0.4002213 0.491551 ZT4-7 0.498671 0.498671 0.498671 ZT8-11 1.7016399999999998 1.7016399999999998 1.7016399999999998 ZT12-15 0 0 0 ZT16-19 1.28 1.28 1.28 ZT20-23 1.3540145 1.3540145 1.3540145