condition mean min max ZT0-3 172.164079 172.164079 172.164079 ZT4-7 446.731456 446.731456 446.731456 ZT8-11 392.9855015 392.9855015 392.9855015 ZT12-15 180.036174 180.036174 180.036174 ZT16-19 119.88366199999999 119.88366199999999 119.88366199999999 ZT20-23 61.5093045 61.5093045 61.5093045