condition mean min max ZT0-3 17.002174 17.002174 17.002174 ZT4-7 15.378592000000001 15.378592000000001 15.378592000000001 ZT8-11 13.216109 13.216109 13.216109 ZT12-15 14.413184000000001 14.413184000000001 14.413184000000001 ZT16-19 13.699522 13.699522 13.699522 ZT20-23 10.449609 10.449609 10.449609