condition mean min max ZT0-3 9.105830000000001 8.85797 9.35369 ZT4-7 4.640000000000001 4.640000000000001 4.640000000000001 ZT8-11 3.26619 3.26619 3.26619 ZT12-15 0 0 0 ZT16-19 6.808855 6.808855 6.808855 ZT20-23 6.632345 6.632345 6.632345