condition mean min max ZT0-3 7.47268 7.47268 7.47268 ZT4-7 6.494305000000001 6.494305000000001 6.494305000000001 ZT8-11 8.41171 8.41171 8.41171 ZT12-15 11.93205 11.93205 11.93205 ZT16-19 11.39265 11.39265 11.39265 ZT20-23 7.433249999999999 7.433249999999999 7.433249999999999