condition mean min max ZT0-3 4.59586 3.92338 4.981615 ZT4-7 3.196585 3.196585 3.196585 ZT8-11 4.698515 4.698515 4.698515 ZT12-15 9.119105000000001 8.683185 9.555025 ZT16-19 7.078895 7.078895 7.078895 ZT20-23 7.459375 7.459375 7.459375