condition mean min max ZT0-3 11.335761 11.335761 11.335761 ZT4-7 10.794343 10.794343 10.794343 ZT8-11 11.5853535 11.5853535 11.5853535 ZT12-15 10.1019545 10.1019545 10.1019545 ZT16-19 14.1692255 14.1692255 14.1692255 ZT20-23 11.9016895 11.9016895 11.9016895