condition mean min max ZT0-3 5.898540000000001 5.3276 6.46948 ZT4-7 4.57266 4.57266 4.57266 ZT8-11 4.469605 4.469605 4.469605 ZT12-15 0 0 0 ZT16-19 7.61253 7.61253 7.61253 ZT20-23 5.246065 5.246065 5.246065