condition mean min max ZT0-3 10.391312 10.391312 10.391312 ZT4-7 10.7181225 10.7181225 10.7181225 ZT8-11 11.699354 11.699354 11.699354 ZT12-15 10.1067795 10.1067795 10.1067795 ZT16-19 10.085631 10.085631 10.085631 ZT20-23 9.691268 9.691268 9.691268