condition mean min max ZT0-3 71.12905 70.17685 72.08125 ZT4-7 77.11345 77.11345 77.11345 ZT8-11 86.1191 86.1191 86.1191 ZT12-15 0 0 0 ZT16-19 99.26245 99.26245 99.26245 ZT20-23 75.4202 75.4202 75.4202