condition mean min max ZT0-3 4.80991 4.80991 4.80991 ZT4-7 4.569559999999999 4.569559999999999 4.569559999999999 ZT8-11 5.507415 5.507415 5.507415 ZT12-15 5.525205 5.525205 5.525205 ZT16-19 6.29232 6.29232 6.29232 ZT20-23 4.352935 4.352935 4.352935