condition mean min max ZT0-3 9.059909999999999 8.564205 9.555615 ZT4-7 9.734065000000001 9.734065000000001 9.734065000000001 ZT8-11 8.685265000000001 8.685265000000001 8.685265000000001 ZT12-15 0 0 0 ZT16-19 10.575489999999999 10.575489999999999 10.575489999999999 ZT20-23 11.22859 11.22859 11.22859