condition mean min max ZT0-3 5.576995 5.3203 5.83369 ZT4-7 6.22266 6.22266 6.22266 ZT8-11 9.372914999999999 9.372914999999999 9.372914999999999 ZT12-15 0 0 0 ZT16-19 11.30303 11.30303 11.30303 ZT20-23 10.376650000000001 10.376650000000001 10.376650000000001