condition mean min max ZT0-3 199.60000000000002 199.60000000000002 199.60000000000002 ZT4-7 258.4 258.4 258.4 ZT8-11 261.54999999999995 261.54999999999995 261.54999999999995 ZT12-15 294.15 294.15 294.15 ZT16-19 272.45 272.45 272.45 ZT20-23 206.4 206.4 206.4