condition mean min max ZT0-3 0.135237 0.0 0.270474 ZT4-7 1.192315 1.192315 1.192315 ZT8-11 2.28156 2.28156 2.28156 ZT12-15 0 0 0 ZT16-19 2.4370765 2.4370765 2.4370765 ZT20-23 0.905283 0.905283 0.905283