condition mean min max ZT0-3 258.0 258.0 258.0 ZT4-7 133.4 133.4 133.4 ZT8-11 200.65 200.65 200.65 ZT12-15 253.64999999999998 253.64999999999998 253.64999999999998 ZT16-19 389.55 389.55 389.55 ZT20-23 312.45 312.45 312.45