condition mean min max ZT0-3 59.609419 59.609419 59.609419 ZT4-7 39.3623195 39.3623195 39.3623195 ZT8-11 54.436513500000004 54.436513500000004 54.436513500000004 ZT12-15 71.808465 71.808465 71.808465 ZT16-19 82.377217 82.377217 82.377217 ZT20-23 98.23609350000001 98.23609350000001 98.23609350000001